diff --git a/src/main/java/org/ntlab/tampoposerver/repositories/ActivityRepository.java b/src/main/java/org/ntlab/tampoposerver/repositories/ActivityRepository.java
index de69a3e..9f20f74 100644
--- a/src/main/java/org/ntlab/tampoposerver/repositories/ActivityRepository.java
+++ b/src/main/java/org/ntlab/tampoposerver/repositories/ActivityRepository.java
@@ -47,7 +47,7 @@
     }
 
     //アクティビティのテキストが存在しないとき
-    public boolean isValidActivity(String userId, String activityId, String textId) {
+    public boolean isValidActivity(String userId, String activityId) {
         HashMap<String, Activity> userActivities = activityMap.get(userId);
         if (userActivities == null) return false;
 
@@ -57,7 +57,7 @@
         String activityText = activity.getText();
         if (activityText == null || activityText == "") return false;
 
-        return activityText.equals(textId);
+        return true;
     }
 
     //アクティビティを削除するメソッド
diff --git a/src/test/java/org/ntlab/tampoposerver/repositories/ActivityRepositoryTest.java b/src/test/java/org/ntlab/tampoposerver/repositories/ActivityRepositoryTest.java
index a20d86f..59910eb 100644
--- a/src/test/java/org/ntlab/tampoposerver/repositories/ActivityRepositoryTest.java
+++ b/src/test/java/org/ntlab/tampoposerver/repositories/ActivityRepositoryTest.java
@@ -50,8 +50,8 @@
         System.out.println(a6);
 
         //アクティビティのテキストが存在しないとき
-        boolean result3 = activityRepository.isValidActivity("abc", a100.getActivityId(), "プログラミングなう");
-        boolean result4 = activityRepository.isValidActivity("abc", a101.getActivityId(), "");
+        boolean result3 = activityRepository.isValidActivity("abc", a100.getActivityId());
+        boolean result4 = activityRepository.isValidActivity("abc", a101.getActivityId());
         assertTrue(result3);   // 一致するので true
         assertFalse(result4);  // activity-id101 が存在しないか、テキストが空なので false
         Activity a7 = activityRepository.getActivity("xyz", a1.getActivityId());