diff --git a/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/controller/ToDoController.java b/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/controller/ToDoController.java
index 6b20956..cf860d8 100644
--- a/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/controller/ToDoController.java
+++ b/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/controller/ToDoController.java
@@ -1,16 +1,14 @@
 package jp.ac.kobe_u.cs.itspecialist.todoapp.controller;
 
 import java.util.List;
+import java.util.Objects;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.validation.BindingResult;
 import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.ModelAttribute;
-import org.springframework.web.bind.annotation.PathVariable;
-import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.*;
 
 import jp.ac.kobe_u.cs.itspecialist.todoapp.dto.LoginForm;
 import jp.ac.kobe_u.cs.itspecialist.todoapp.dto.ToDoForm;
@@ -54,27 +52,47 @@ public class ToDoController {
      * ユーザのToDoリストのページ
      */
     @GetMapping("/{mid}/todos")
-    String showToDoList(@PathVariable String mid, @ModelAttribute(name = "ToDoForm") ToDoForm form, Model model) {
+    String showToDoList(@PathVariable String mid,
+                        @RequestParam(name="sort_by", required = false) String sortBy,
+                        @RequestParam(name="order", required = false) String order,
+                        @ModelAttribute(name = "ToDoForm") ToDoForm form, Model model) {
         Member m = mService.getMember(mid);
+        // デフォルト値を入れておく．
+        sortBy = getDefault(sortBy, "seq");
+        order = getDefault(order, "asc");
+
         model.addAttribute("member", m);
         model.addAttribute("ToDoForm", form);
-        List<ToDo> todos = tService.getToDoList(mid);
+        List<ToDo> todos = tService.getToDoList(mid, sortBy, order);
         model.addAttribute("todos", todos);
-        List<ToDo> dones = tService.getDoneList(mid);
+        List<ToDo> dones = tService.getDoneList(mid, sortBy, order);
         model.addAttribute("dones", dones);
         return "list";
     }
 
+    private String getDefault(String value, String defaultValue) {
+        if(value == null || Objects.equals(value.trim(), "")) {
+            return defaultValue;
+        }
+        return value;
+    }
+
     /**
      * 全員のToDoリストのページ
      */
     @GetMapping("/{mid}/todos/all")
-    String showAllToDoList(@PathVariable String mid, Model model) {
+    String showAllToDoList(@PathVariable String mid,
+                           @RequestParam(name="sort_by", required = false) String sortBy,
+                           @RequestParam(name="order", required = false) String order,
+                           Model model) {
         Member m = mService.getMember(mid);
+        // デフォルト値を入れておく．
+        sortBy = getDefault(sortBy, "seq");
+        order = getDefault(order, "asc");
         model.addAttribute("member", m);
-        List<ToDo> todos = tService.getToDoList();
+        List<ToDo> todos = tService.getToDoList(sortBy, order);
         model.addAttribute("todos", todos);
-        List<ToDo> dones = tService.getDoneList();
+        List<ToDo> dones = tService.getDoneList(sortBy, order);
         model.addAttribute("dones", dones);
         return "alllist";
     }
@@ -86,7 +104,7 @@ public class ToDoController {
     String createToDo(@PathVariable String mid, @Validated @ModelAttribute(name = "ToDoForm") ToDoForm form,
             BindingResult bindingResult, Model model) {
         if (bindingResult.hasErrors()) {
-            return showToDoList(mid, form, model);
+            return showToDoList(mid, "seq", "asc", form, model);
         }
         tService.createToDo(mid, form);
         return "redirect:/" + mid + "/todos";
diff --git a/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/controller/ToDoRestController.java b/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/controller/ToDoRestController.java
index 1862695..79f33d3 100644
--- a/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/controller/ToDoRestController.java
+++ b/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/controller/ToDoRestController.java
@@ -49,13 +49,13 @@ public class ToDoRestController {
     /* --- R: ToDoを取得する (リスト) --- */
     @GetMapping("/{mid}/todos")
     List<ToDo> getToDoList(@PathVariable String mid) {
-        return todoService.getToDoList(mid);
+        return todoService.getToDoList(mid, "seq", "asc");
     }
 
     /* --- R: Doneを取得する (リスト) --- */
     @GetMapping("/{mid}/dones")
     List<ToDo> getDoneList(@PathVariable String mid) {
-        return todoService.getDoneList(mid);
+        return todoService.getDoneList(mid, "seq", "asc");
     }
 
     /* --- U: ToDoを完了する --- */
diff --git a/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/repository/ToDoRepository.java b/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/repository/ToDoRepository.java
index 4d7767c..109c789 100644
--- a/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/repository/ToDoRepository.java
+++ b/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/repository/ToDoRepository.java
@@ -13,4 +13,26 @@ public interface ToDoRepository extends CrudRepository<ToDo, Long> {
     List<ToDo> findByDone(boolean done);
     List<ToDo> findByMid(String mid);
     List<ToDo> findByMidAndDone(String mid, boolean done);
+
+    // ソート機能を追加する．
+    List<ToDo> findByDoneOrderBySeqAsc(boolean done);
+    List<ToDo> findByDoneOrderBySeqDesc(boolean done);
+    List<ToDo> findByDoneOrderByTitleAsc(boolean done);
+    List<ToDo> findByDoneOrderByTitleDesc(boolean done);
+    List<ToDo> findByDoneOrderByMidAsc(boolean done);
+    List<ToDo> findByDoneOrderByMidDesc(boolean done);
+    List<ToDo> findByDoneOrderByCreatedAtAsc(boolean done);
+    List<ToDo> findByDoneOrderByCreatedAtDesc(boolean done);
+    List<ToDo> findByDoneOrderByDoneAtAsc(boolean done);
+    List<ToDo> findByDoneOrderByDoneAtDesc(boolean done);
+
+    List<ToDo> findByMidAndDoneOrderBySeqAsc(String mid, boolean done);
+    List<ToDo> findByMidAndDoneOrderBySeqDesc(String mid, boolean done);
+    List<ToDo> findByMidAndDoneOrderByTitleAsc(String mid, boolean done);
+    List<ToDo> findByMidAndDoneOrderByTitleDesc(String mid, boolean done);
+    List<ToDo> findByMidAndDoneOrderByCreatedAtAsc(String mid, boolean done);
+    List<ToDo> findByMidAndDoneOrderByCreatedAtDesc(String mid, boolean done);
+    List<ToDo> findByMidAndDoneOrderByDoneAtAsc(String mid, boolean done);
+    List<ToDo> findByMidAndDoneOrderByDoneAtDesc(String mid, boolean done);
+
 }
diff --git a/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/service/ToDoService.java b/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/service/ToDoService.java
index 57a6371..42bd8f5 100644
--- a/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/service/ToDoService.java
+++ b/src/main/java/jp/ac/kobe_u/cs/itspecialist/todoapp/service/ToDoService.java
@@ -1,9 +1,14 @@
 package jp.ac.kobe_u.cs.itspecialist.todoapp.service;
 
 import java.util.Date;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.function.BiFunction;
+import java.util.function.Function;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.util.Pair;
 import org.springframework.stereotype.Service;
 
 import jp.ac.kobe_u.cs.itspecialist.todoapp.dto.ToDoForm;
@@ -48,35 +53,73 @@ public class ToDoService {
      * @param mid
      * @return
      */
-    public List<ToDo> getToDoList(String mid) {
-        return tRepo.findByMidAndDone(mid, false);
+    public List<ToDo> getToDoList(String mid, String sortBy, String order) {
+        BiFunction<String, Boolean, List<ToDo>> finder = midAndDoneFinder.getOrDefault(Pair.of(sortBy, order),
+                (memberId, doneFlag) -> tRepo.findByMidAndDone(memberId, doneFlag));
+        return finder.apply(mid, false);
     }
     /**
      * あるメンバーのDoneリストを取得する (R)
      * @param mid
      * @return
      */
-    public List<ToDo> getDoneList(String mid) {
-        return tRepo.findByMidAndDone(mid, true);
+    public List<ToDo> getDoneList(String mid, String sortBy, String order) {
+        BiFunction<String, Boolean, List<ToDo>> finder = midAndDoneFinder.getOrDefault(Pair.of(sortBy, order),
+                (memberId, doneFlag) -> tRepo.findByMidAndDone(memberId, doneFlag));
+        return finder.apply(mid, true);
+    }
+
+    private final Map<Pair<String, String>, BiFunction<String, Boolean, List<ToDo>>> midAndDoneFinder = generateMidAndDoneFinder();
+    private Map<Pair<String, String>, BiFunction<String, Boolean, List<ToDo>>> generateMidAndDoneFinder() {
+        Map<Pair<String, String>, BiFunction<String, Boolean, List<ToDo>>> map = new HashMap<>();
+        map.put(Pair.of("seq", "asc"), (mid, done) -> tRepo.findByMidAndDoneOrderBySeqAsc(mid, done));
+        map.put(Pair.of("seq", "desc"), (mid, done) -> tRepo.findByMidAndDoneOrderBySeqDesc(mid, done));
+        map.put(Pair.of("title", "asc"), (mid, done) -> tRepo.findByMidAndDoneOrderByTitleAsc(mid, done));
+        map.put(Pair.of("title", "desc"), (mid, done) -> tRepo.findByMidAndDoneOrderByTitleDesc(mid, done));
+        map.put(Pair.of("created_at", "asc"), (mid, done) -> tRepo.findByMidAndDoneOrderByCreatedAtAsc(mid, done));
+        map.put(Pair.of("created_at", "desc"), (mid, done) -> tRepo.findByMidAndDoneOrderByCreatedAtDesc(mid, done));
+        map.put(Pair.of("done_at", "asc"), (mid, done) -> tRepo.findByMidAndDoneOrderByDoneAtAsc(mid, done));
+        map.put(Pair.of("done_at", "desc"), (mid, done) -> tRepo.findByMidAndDoneOrderByDoneAtDesc(mid, done));
+        return map;
     }
 
     /**
      * 全員のToDoリストを取得する (R)
      * @return
      */
-    public List<ToDo> getToDoList() {
-        return tRepo.findByDone(false);
+    public List<ToDo> getToDoList(String sortBy, String order) {
+        Function<Boolean, List<ToDo>> finder = doneFinder.getOrDefault(Pair.of(sortBy, order),
+                (doneFlag) -> tRepo.findByDone(doneFlag));
+        return finder.apply(false);
     }
 
     /**
      * 全員のDoneリストを取得する (R)
      * @return
      */
-    public List<ToDo> getDoneList() {
-        return tRepo.findByDone(true);
+    public List<ToDo> getDoneList(String sortBy, String order) {
+        Function<Boolean, List<ToDo>> finder = doneFinder.getOrDefault(Pair.of(sortBy, order),
+                (doneFlag) -> tRepo.findByDone(doneFlag));
+        return finder.apply(true);
     }
 
 
+    private final Map<Pair<String, String>, Function<Boolean, List<ToDo>>> doneFinder = generateDoneFinder();
+    private Map<Pair<String, String>, Function<Boolean, List<ToDo>>> generateDoneFinder() {
+        Map<Pair<String, String>, Function<Boolean, List<ToDo>>> map = new HashMap<>();
+        map.put(Pair.of("seq", "asc"), (doneFlag) -> tRepo.findByDoneOrderBySeqAsc(doneFlag));
+        map.put(Pair.of("seq", "desc"), (doneFlag) -> tRepo.findByDoneOrderBySeqDesc(doneFlag));
+        map.put(Pair.of("title", "asc"), (doneFlag) -> tRepo.findByDoneOrderByTitleAsc(doneFlag));
+        map.put(Pair.of("title", "desc"), (doneFlag) -> tRepo.findByDoneOrderByTitleDesc(doneFlag));
+        map.put(Pair.of("mid", "asc"), (doneFlag) -> tRepo.findByDoneOrderByMidAsc(doneFlag));
+        map.put(Pair.of("mid", "desc"), (doneFlag) -> tRepo.findByDoneOrderByMidDesc(doneFlag));
+        map.put(Pair.of("created_at", "asc"), (doneFlag) -> tRepo.findByDoneOrderByCreatedAtAsc(doneFlag));
+        map.put(Pair.of("created_at", "desc"), (doneFlag) -> tRepo.findByDoneOrderByCreatedAtDesc(doneFlag));
+        map.put(Pair.of("done_at", "asc"), (doneFlag) -> tRepo.findByDoneOrderByDoneAtAsc(doneFlag));
+        map.put(Pair.of("done_at", "desc"), (doneFlag) -> tRepo.findByDoneOrderByDoneAtDesc(doneFlag));
+        return map;
+    }
+
     /**
      * ToDoを完了する
      * @param mid 完了者
diff --git a/src/main/resources/templates/alllist.html b/src/main/resources/templates/alllist.html
index 8580517..fa723b4 100644
--- a/src/main/resources/templates/alllist.html
+++ b/src/main/resources/templates/alllist.html
@@ -15,10 +15,26 @@
     <h2>ToDo</h2>
     <table border="1">
         <tr>
-            <th>#</th>
-            <th>タイトル</th>
-            <th>作成者</th>
-            <th>作成日時</th>
+            <th>
+                #
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'seq'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'seq'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                タイトル
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'title'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'title'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                作成者
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'mid'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'mid'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                作成日時
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'created_at'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'created_at'}, order=${'desc'})}">↑</a>
+            </th>
         </tr>
         <tr th:each="todo: ${todos}">
             <td>[[${todo.seq}]]</td>
@@ -31,10 +47,26 @@
     <h2>Done</h2>
     <table border="1">
         <tr>
-            <th>#</th>
-            <th>タイトル</th>
-            <th>作成者</th>
-            <th>完了日時</th>
+            <th>
+                #
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'seq'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'seq'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                タイトル
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'title'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'title'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                作成者
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'mid'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'mid'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                完了日時
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'done_at'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos/all(mid=${member.mid}, sort_by=${'done_at'}, order=${'desc'})}">↑</a>
+            </th>
         </tr>
         <tr th:each="done: ${dones}">
             <td>[[${done.seq}]]</td>
diff --git a/src/main/resources/templates/list.html b/src/main/resources/templates/list.html
index a2939b9..e9bda05 100644
--- a/src/main/resources/templates/list.html
+++ b/src/main/resources/templates/list.html
@@ -15,9 +15,21 @@
     <h2>ToDo</h2>
     <table border="1">
         <tr>
-            <th>#</th>
-            <th>タイトル</th>
-            <th>作成日時</th>
+            <th>
+                #
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'seq'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'seq'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                タイトル
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'title'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'title'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                作成日時
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'created_at'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'created_at'}, order=${'desc'})}">↑</a>
+            </th>
             <th>コマンド</th>
         </tr>
         <tr th:each="todo: ${todos}">
@@ -45,10 +57,26 @@
     <h2>Done</h2>
     <table border="1">
         <tr>
-            <th>#</th>
-            <th>タイトル</th>
-            <th>作成日時</th>
-            <th>完了日時</th>
+            <th>
+                #
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'seq'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'seq'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                タイトル
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'title'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'title'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                作成日時
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'created_at'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'created_at'}, order=${'desc'})}">↑</a>
+            </th>
+            <th>
+                完了日時
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'done_at'}, order=${'asc'})}">↓</a>
+                <a th:href="@{/{mid}/todos(mid=${member.mid}, sort_by=${'done_at'}, order=${'desc'})}">↑</a>
+            </th>
         </tr>
         <tr th:each="done: ${dones}">
             <td>[[${done.seq}]]</td>