diff --git a/em-oop/src/Main.java b/em-oop/src/Main.java
index 15c9136..7622493 100644
--- a/em-oop/src/Main.java
+++ b/em-oop/src/Main.java
@@ -63,7 +63,7 @@ public class Main {
 				"13"
 		);
 		
-		//
+		//社員＋部署をまとめる配列
 		BaseData[] allData = new BaseData[11];
 		
 		//
@@ -71,6 +71,7 @@ public class Main {
 			allData[i] = Employees[i];
 		}
 		
+		//部署データ6件
 		DepartmentData dept1 = new DepartmentData();
 		dept1.setIdDepartment("10");
 		dept1.setNmDepartment("役員");
@@ -107,10 +108,37 @@ public class Main {
 		
 		allData[10] = dept6;
 		
+		//全データ表示
 		for (int i = 0; i < allData.length; i++) {
 			System.out.println(allData[i]);
 		}
 		
+		//7段階目：instanceofで型を確認しよう
+		int employeeCount = 0;
+		int departmentCount = 0;
+		
+		for(int i = 0; i < allData.length; i++) {
+			if(allData[i] instanceof EmployeeData) {
+				employeeCount++;
+			}
+			
+			if(allData[i] instanceof DepartmentData) {
+				departmentCount++;
+			}
+		}
+		
+		System.out.println("社員データ" + employeeCount + "件");
+		System.out.println("部署データ" + departmentCount + "件");
+		
+		//全社員のメールアドレスを表示
+		for(int i = 0; i < allData.length; i++) {
+			if(allData[i] instanceof EmployeeData) {
+				EmployeeData employeeData = (EmployeeData) allData[i];
+				
+				System.out.println(employeeData.getMailAddress());
+			}
+		}
+		
 //		Employees[0].setIdEmployee("10000");
 //		Employees[0].setNmEmployee("山田龍也");
 //		Employees[0].setKnEmployee("ヤマダタツヤ");