diff --git a/em-oop/src/EmployeeData.java b/em-oop/src/EmployeeData.java
index 16c224b..21b44a1 100644
--- a/em-oop/src/EmployeeData.java
+++ b/em-oop/src/EmployeeData.java
@@ -35,6 +35,19 @@ public class EmployeeData {
 				+ "\t" + this.password + "\t" + this.idDepartment;
 	}
 
+	public boolean isMatchId(String id) {
+		return getIdEmployee().equals(id);
+	}
+
+	public static boolean isMatchId(EmployeeData[] employees, String id) {
+		for (EmployeeData e : employees) {
+			if (e.isMatchId(id))
+				return true;
+
+		}
+		return false;
+	}
+
 	public String getIdEmployee() {
 		return idEmployee;
 	}
@@ -98,4 +111,5 @@ public class EmployeeData {
 		}
 		return true;
 	}
+
 }
diff --git a/em-oop/src/Main.java b/em-oop/src/Main.java
index ff9ffd7..38af64c 100644
--- a/em-oop/src/Main.java
+++ b/em-oop/src/Main.java
@@ -70,6 +70,24 @@ public class Main {
 		EmployeeData emptyEmployee = new EmployeeData("", "", "", "", "", "");
 		System.out.println(emptyEmployee);
 
+		System.out.println();
+
+		//IDが一致するか
+		boolean matchIdBool = false;
+		System.out.println("10002 を検索します");
+		for (EmployeeData e : employees) {
+			matchIdBool = e.isMatchId("10002");
+			if (matchIdBool)
+				break;
+		}
+		System.out.println(matchIdBool);
+
+		System.out.println("99999 を検索します");
+		System.out.println(EmployeeData.isMatchId(employees, "99999"));
+
+		System.out.println("10003 を検索します");
+		System.out.println(EmployeeData.isMatchId(employees, "10003"));
+
 	}
 
 }