diff --git a/controller.png b/controller.png
index e6e9232..32c187f 100644
--- a/controller.png
+++ b/controller.png
Binary files differ
diff --git a/controller.pu b/controller.pu
index 3a7f87c..8049e4b 100644
--- a/controller.pu
+++ b/controller.pu
@@ -19,6 +19,7 @@
 	state "ログアウト" as logout_
 	state "BLDGデータリスト" as indeies_
 	state "マッパーリスト" as list_
+	state "管理" as admin_
 	state "使い方（外部リンク）" as howto_
 	logout_ --> logout_ : /logout
 }
@@ -56,6 +57,10 @@
 	task : updateTime
 }
 
+state "管理" as admin {
+	admin : download
+}
+
 state "外部リンク" as howto {
 	howto : "https://github.com/yuuhayashi/task-bldg/wiki"
 }
@@ -77,5 +82,7 @@
 meshes --> tasks : /tasks
 tasks -> task : /task
 tasks <- task : /tasks
+admin_ --> admin	: /admin
+admin --> admin		: /admin/download
 
 @enduml
\ No newline at end of file
diff --git a/src/main/java/osm/surveyor/task/city/TaskController.java b/src/main/java/osm/surveyor/task/city/TaskController.java
index bc61f24..91c98d9 100644
--- a/src/main/java/osm/surveyor/task/city/TaskController.java
+++ b/src/main/java/osm/surveyor/task/city/TaskController.java
@@ -1,8 +1,12 @@
 package osm.surveyor.task.city;
 
+import java.io.IOException;
+import java.io.OutputStream;
 import java.util.List;
 import java.util.UUID;
 
+import javax.servlet.http.HttpServletResponse;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
@@ -176,6 +180,44 @@
 		return "redirect:/tasks?citycode="+ task.getCitycode() +"&meshcode="+ task.getMeshcode();
 	}
 	
+	@GetMapping("/admin")
+	public String admin()
+	{
+		return "admin";
+	}
+
+	@PostMapping("/admin/download")
+    public String download(HttpServletResponse response) {
+        try (OutputStream os = response.getOutputStream();) {
+        	List<Task> list = taskRepository.findAll();
+        	StringBuffer sb = new StringBuffer();
+    		boolean c1 = false;
+        	sb.append("[");
+        	sb.append(System.lineSeparator());
+        	for (Task task : list) {
+    			if (c1) {
+    				sb.append(",");
+    			}
+    			else {
+    				c1 = true;
+    			}
+        		sb.append(task.toString());
+            	sb.append(System.lineSeparator());
+        	}
+        	sb.append("]");
+            byte[] fb1 = String.valueOf(sb).getBytes();
+
+            response.setContentType("application/octet-stream");
+            response.setHeader("Content-Disposition", "attachment; filename="+ "task-bldg.json");
+            response.setContentLength(fb1.length);
+            os.write(fb1);
+            os.flush();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+	
 	/**
 	 * 400 Bad Request
 	 * 
diff --git a/src/main/java/osm/surveyor/task/city/TaskService.java b/src/main/java/osm/surveyor/task/city/TaskService.java
index f308c0c..5cc9a1e 100644
--- a/src/main/java/osm/surveyor/task/city/TaskService.java
+++ b/src/main/java/osm/surveyor/task/city/TaskService.java
@@ -165,5 +165,4 @@
 	public List<Task> getTasks() {
 		return repository.findAll();
 	}
-
 }
diff --git a/src/main/java/osm/surveyor/task/city/model/Task.java b/src/main/java/osm/surveyor/task/city/model/Task.java
index 7b279b7..c5560b7 100644
--- a/src/main/java/osm/surveyor/task/city/model/Task.java
+++ b/src/main/java/osm/surveyor/task/city/model/Task.java
@@ -14,13 +14,16 @@
 
 import org.springframework.format.annotation.NumberFormat;
 
+import com.fasterxml.jackson.databind.JsonNode;
+
 import lombok.Getter;
 import lombok.Setter;
+import osm.surveyor.task.util.JsonTemple;
 
 @Getter
 @Setter
 @Entity
-public class Task {
+public class Task extends JsonTemple {
 	
     @Id
     @Column(name = "current_id")
@@ -78,4 +81,29 @@
 	 */
 	@Temporal(TemporalType.TIMESTAMP)
     Date updateTime;
+	
+	@Override
+	public String toString() {
+		StringBuffer sb = new StringBuffer();
+		boolean c1 = false;
+		sb.append("{");
+		c1 = outStr(c1, sb, "currentId", this.getCurrentId());
+		c1 = outStr(c1, sb, "preId", this.getPreId());
+		c1 = outStr(c1, sb, "citycode", this.getCitycode());
+		c1 = outStr(c1, sb, "meshcode", this.getMeshcode());
+		c1 = outStr(c1, sb, "status", this.getStatus().toString());
+		c1 = outStr(c1, sb, "username", this.getUsername());
+		c1 = outStr(c1, sb, "validator", this.getValidator());
+		c1 = outStr(c1, sb, "changeSet", this.getChangeSet());
+		c1 = outStr(c1, sb, "comment", this.getComment());
+		c1 = outStr(c1, sb, "operation", this.getOperation().toString());
+		c1 = outStr(c1, sb, "updateTime", this.getUpdateTime().toString());
+		sb.append("}");
+		return sb.toString();
+	}
+	
+	@Override
+	public void parse(JsonNode node) {
+		// TODO
+	}
 }
diff --git a/src/main/resources/templates/admin.html b/src/main/resources/templates/admin.html
new file mode 100644
index 0000000..c24caab
--- /dev/null
+++ b/src/main/resources/templates/admin.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org"
+  xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
+  layout:decorate="~{layout/layout}">
+<head>
+  <meta charset="UTF-8" th:remove="tag" />
+</head>
+<body>
+
+  <!-- サイドバーの表示 -->
+  <div layout:fragment="sidebar" th:replace="~{fragments/sidebar :: sidebar}">
+  </div>
+
+  <!-- コンテンツの表示 -->
+  <div layout:fragment="content">
+    <main class="offcanvas-outside bg-light">
+      <div class="container-fluid">
+
+        <!-- トグルボタン -->
+        <div th:replace="~{fragments/sidebar :: toggler}">
+        </div>
+
+        <div class="row">
+          <div class="col">
+
+            <div class="card shadow">
+              <div class="card-header">
+                <h6 class="text-navy my-2" th:text="${command}"></h6>
+              </div>
+              <div class="card-body">
+
+                <form th:action="@{/admin/download}" method="post" novalidate>
+                  <div class="mb-3">
+                    <label for="username" class="form-label">
+                      データダウンロード
+                    </label>
+                  </div>
+
+                  <p class="error_red" th:text="${error}"></p>
+                  <p class="error_red" th:text="${message}"></p>
+
+                  <button class="btn btn-navy col-4">
+                    <i class="bi bi-pencil-square">データダウンロード</i>
+                  </button>
+
+                </form>
+              </div>
+            </div>
+
+          </div>
+        </div>
+      </div>
+    </main>
+  </div>
+</body>
+</html>
diff --git a/src/main/resources/templates/fragments/sidebar.html b/src/main/resources/templates/fragments/sidebar.html
index 27dcd0b..5752b84 100644
--- a/src/main/resources/templates/fragments/sidebar.html
+++ b/src/main/resources/templates/fragments/sidebar.html
@@ -55,6 +55,12 @@
               </a>
             </li>
             <li class="nav-item">
+              <a th:href="@{/admin}" class="nav-link text-white">
+                <i class="bi bi-table me-2"></i>
+                管理
+              </a>
+            </li>
+            <li class="nav-item">
               <a href="https://github.com/yuuhayashi/task-bldg/wiki" class="nav-link text-white">
                 <i class="bi bi-box-arrow-right me-2"></i>
                 使い方 (外部リンク)