diff --git a/src/components/Modal/GroupMemberAddModal/GroupMemberAddModal.vue b/src/components/Modal/GroupMemberAddModal/GroupMemberAddModal.vue
index 0b23ea2e0..810983158 100644
--- a/src/components/Modal/GroupMemberAddModal/GroupMemberAddModal.vue
+++ b/src/components/Modal/GroupMemberAddModal/GroupMemberAddModal.vue
@@ -53,18 +53,10 @@ const add = async () => {
   isAdding.value = true
   const reqIds = Array.from(userIds.value)
   try {
-    if (reqIds.length === 1 && reqIds[0]) {
-      const userId = reqIds[0]
-      await apis.addUserGroupMember(props.id, {
-        id: userId,
-        role: role.value
-      })
-    } else {
-      await apis.addUserGroupMember(
-        props.id,
-        reqIds.map(id => ({ id, role: role.value }))
-      )
-    }
+    await apis.addUserGroupMember(
+      props.id,
+      reqIds.map(id => ({ id, role: role.value }))
+    )
   } catch {
     addErrorToast('グループメンバーの追加に失敗しました')
   }