diff --git a/src/main/java/com/example/rhizome/app/domain/service/DeleteDepartment.java b/src/main/java/com/example/rhizome/app/domain/service/DeleteDepartment.java
new file mode 100644
index 0000000..3a80a81
--- /dev/null
+++ b/src/main/java/com/example/rhizome/app/domain/service/DeleteDepartment.java
@@ -0,0 +1,5 @@
+package com.example.rhizome.app.domain.service;
+
+public interface DeleteDepartment {
+    void deleteDepartment(Integer idDepartment);
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/rhizome/app/domain/service/impl/DeleteDepartmentImpl.java b/src/main/java/com/example/rhizome/app/domain/service/impl/DeleteDepartmentImpl.java
new file mode 100644
index 0000000..a0b1357
--- /dev/null
+++ b/src/main/java/com/example/rhizome/app/domain/service/impl/DeleteDepartmentImpl.java
@@ -0,0 +1,27 @@
+package com.example.rhizome.app.domain.service.impl;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.rhizome.app.domain.service.DeleteDepartment;
+import com.example.rhizome.app.infra.repository.DepartmentRepository;
+
+//@Srviceをつけ忘れるとControllerで使うときに起動時エラーになってしまう
+@Service
+@Transactional
+public class DeleteDepartmentImpl implements DeleteDepartment {
+
+	DepartmentRepository departmentRepository;
+
+	@Autowired
+	public DeleteDepartmentImpl(DepartmentRepository departmentRepository) {
+		this.departmentRepository = departmentRepository;
+	}
+
+	public void deleteDepartment(Integer idDepartment) {
+		// ★考える：Repository のどのメソッドで「IDを指定して削除」できる？
+		//          （お手本の DeleteEmployeeImpl を見る）
+		departmentRepository.deleteById(idDepartment);
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/rhizome/app/presentation/controller/DeleteDepartmentController.java b/src/main/java/com/example/rhizome/app/presentation/controller/DeleteDepartmentController.java
new file mode 100644
index 0000000..86d89f8
--- /dev/null
+++ b/src/main/java/com/example/rhizome/app/presentation/controller/DeleteDepartmentController.java
@@ -0,0 +1,79 @@
+package com.example.rhizome.app.presentation.controller;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.servlet.http.HttpSession;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import com.example.rhizome.app.domain.model.SearchConditionDepartment;
+import com.example.rhizome.app.domain.service.DeleteDepartment;
+import com.example.rhizome.app.domain.service.SearchDepartment;
+import com.example.rhizome.app.domain.service.SearchEmployee;
+import com.example.rhizome.app.presentation.controller.pageproperty.PageReturnAttributeKeyword;
+import com.example.rhizome.app.presentation.controller.pageproperty.TransitionTargetPageNameKeyword;
+import com.example.rhizome.app.presentation.form.MessageForm;
+
+@Controller
+public class DeleteDepartmentController {
+
+	private final static Logger LOGGER = Logger.getLogger(DeleteDepartmentController.class.getName());
+	private final static String SEVERE_ERROR_MESSAGE = "エラーが発生しました！";
+
+	HttpSession httpSession;
+	DeleteDepartment deleteDepartment;
+	SearchDepartment searchDepartment;
+	SearchEmployee searchEmployee; // 所属社員の確認に使う（既存）
+
+	@Autowired
+	public DeleteDepartmentController(HttpSession httpSession, DeleteDepartment deleteDepartment,
+			SearchDepartment searchDepartment, SearchEmployee searchEmployee) {
+		this.httpSession = httpSession;
+		this.deleteDepartment = deleteDepartment;
+		this.searchDepartment = searchDepartment;
+		this.searchEmployee = searchEmployee;
+	}
+
+	@RequestMapping(value = TransitionTargetPageNameKeyword.DELETE_DEPARTMENT, method = RequestMethod.POST)
+	public String deleteDepartment(@RequestParam(value = "idDepartment", required = false) Integer idDepartment,
+			Model model) {
+
+		final String UNKNOWN_ID = "削除対象のIDが不明です。";
+		final String HAS_EMPLOYEE = "1名以上が所属している部署は削除出来ません。";
+		final String DELETE_COMPLETE = "削除しました。";
+
+		try {
+			// ★① idDepartment が null、または searchDepartment.searchBy(new SearchConditionDepartment(idDepartment, null)) が空
+			//     → MESSAGE_ERROR に UNKNOWN_ID を載せて一覧へ
+			if (idDepartment == null
+					|| searchDepartment.searchBy(new SearchConditionDepartment(idDepartment, null)).isEmpty()) {
+				model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(UNKNOWN_ID));
+				return TransitionTargetPageNameKeyword.SELECT_DEPARTMENT_HTML;
+			}
+			// ★② searchEmployee.searchEmployeeByIdDepartment(idDepartment) が空でない
+			//     → MESSAGE_ERROR に HAS_EMPLOYEE を載せて一覧へ
+			if (!searchEmployee.searchEmployeeByIdDepartment(idDepartment).isEmpty()) {
+				model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(UNKNOWN_ID));
+				return TransitionTargetPageNameKeyword.SELECT_DEPARTMENT_HTML;
+			}
+			// ★③ deleteDepartment.deleteDepartment(idDepartment) → MESSAGE_INFO に DELETE_COMPLETE を載せて一覧へ
+			deleteDepartment.deleteDepartment(idDepartment);
+			model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(UNKNOWN_ID));
+
+			//以下がメッセージの載せ方
+			//model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(UNKNOWN_ID));
+			return "一覧へ戻る（ステップ 2-5 で決める）";
+		} catch (Exception e) {
+			httpSession.invalidate();
+			e.printStackTrace();
+			LOGGER.log(Level.SEVERE, SEVERE_ERROR_MESSAGE, e);
+			return TransitionTargetPageNameKeyword.ERROR_HTML;
+		}
+	}
+}
diff --git a/src/main/java/com/example/rhizome/app/presentation/controller/SelectDepartmentController.java b/src/main/java/com/example/rhizome/app/presentation/controller/SelectDepartmentController.java
index effc20b..63bef84 100644
--- a/src/main/java/com/example/rhizome/app/presentation/controller/SelectDepartmentController.java
+++ b/src/main/java/com/example/rhizome/app/presentation/controller/SelectDepartmentController.java
@@ -62,4 +62,18 @@ public class SelectDepartmentController {
 			return TransitionTargetPageNameKeyword.ERROR_HTML;
 		}
 	}
+
+	@RequestMapping(value = TransitionTargetPageNameKeyword.SELECT_DEPARTMENT_FORM_EMPTY, method = RequestMethod.POST)
+	public String select(Model model) {
+		try {
+			// ★全件取得 → DepartmentForm に変換 → DEPARTMENT_FORM_LIST で model へ
+			return TransitionTargetPageNameKeyword.SELECT_DEPARTMENT_HTML;
+		} catch (Exception e) {
+			httpSession.invalidate();
+			e.printStackTrace();
+			LOGGER.log(Level.SEVERE, SEVERE_ERROR_MESSAGE, e);
+			return TransitionTargetPageNameKeyword.ERROR_HTML;
+		}
+
+	}
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/rhizome/app/presentation/controller/pageproperty/TransitionTargetPageNameKeyword.java b/src/main/java/com/example/rhizome/app/presentation/controller/pageproperty/TransitionTargetPageNameKeyword.java
index 68eae5d..014702c 100644
--- a/src/main/java/com/example/rhizome/app/presentation/controller/pageproperty/TransitionTargetPageNameKeyword.java
+++ b/src/main/java/com/example/rhizome/app/presentation/controller/pageproperty/TransitionTargetPageNameKeyword.java
@@ -50,6 +50,8 @@ public class TransitionTargetPageNameKeyword {
 	public static final String SELECT_DEPARTMENT_HTML = "selectDepartment";
 	// Controller
 	public static final String SELECT_DEPARTMENT = "/selectDepartment";
+	public static final String DELETE_DEPARTMENT = "/deleteDepartment";
+	public static final String SELECT_DEPARTMENT_FORM_EMPTY = "/selectDepartmentAll";
 
 	/**
 	 * 管理者向けのページリストを返す