diff --git a/src/main/java/com/example/rhizome/app/domain/service/SearchDepartment.java b/src/main/java/com/example/rhizome/app/domain/service/SearchDepartment.java
index a0edfd6..f8a6517 100644
--- a/src/main/java/com/example/rhizome/app/domain/service/SearchDepartment.java
+++ b/src/main/java/com/example/rhizome/app/domain/service/SearchDepartment.java
@@ -6,9 +6,7 @@ import com.example.rhizome.app.domain.model.Department;
 import com.example.rhizome.app.domain.model.SearchConditionDepartment;
 
 public interface SearchDepartment {
-	List<Department> searchDepartment(String nmDepartment);
-	
-	List<Department> searchDepartmentById(Integer idDepartment);
+	Department searchDepartmentById(Integer idDepartment);
 	
     List<Department> selectAll();
 
diff --git a/src/main/java/com/example/rhizome/app/domain/service/impl/SearchDepartmentImpl.java b/src/main/java/com/example/rhizome/app/domain/service/impl/SearchDepartmentImpl.java
index 2715659..8e82288 100644
--- a/src/main/java/com/example/rhizome/app/domain/service/impl/SearchDepartmentImpl.java
+++ b/src/main/java/com/example/rhizome/app/domain/service/impl/SearchDepartmentImpl.java
@@ -40,13 +40,13 @@ public class SearchDepartmentImpl implements SearchDepartment {
      * @param nmDepartment 検索対象の nmDepartment
      * @return Table から取得したレコードの情報
      */
-    public List<Department> searchDepartment(String nmDepartment) {
+    public List<Department> searchDepartmentByName(String nmDepartment) {
     	return DepartmentEntity.createDepartmentList(departmentRepository.findByNmDepartment(nmDepartment).stream().toList());
     }
     
     @Override
-    public List<Department> searchDepartmentById(Integer idDepartment) {
-    	return DepartmentEntity.createDepartmentList(departmentRepository.findByIdDepartment(idDepartment).stream().toList());
+    public Department searchDepartmentById(Integer idDepartment) {
+    	return DepartmentEntity.createDepartment(departmentRepository.findByIdDepartment(idDepartment).orElse(new DepartmentEntity()));
     }
 
     /**