diff --git a/program/serializers.py b/program/serializers.py
index e0d445eb62a35d3e602569bd3b5ee08e470b4a8b..e0367f3e37dfe9e72c675172c7643951ecd7288f 100644
--- a/program/serializers.py
+++ b/program/serializers.py
@@ -666,6 +666,7 @@ class TimeSlotSerializer(serializers.ModelSerializer):
     class Meta:
         model = TimeSlot
         fields = (
+            "id",
             "end",
             "memo",
             "note_id",