diff --git a/main.go b/main.go
index 535defe..9460054 100644
--- a/main.go
+++ b/main.go
@@ -49,6 +49,7 @@ func lookupWaitingUserIndex(userID string) int {
 
 func main() {
 	discordToken := os.Getenv("DISCORD_TOKEN")
+	discordChannelId := os.Getenv("DISCORD_CHANNEL_ID")
 
 	discord, err := discordgo.New("Bot " + discordToken)
 	if err != nil {
@@ -61,6 +62,14 @@ func main() {
 	})
 	discord.AddHandler(func(s *discordgo.Session, i *discordgo.InteractionCreate) {
 		if i.Type == discordgo.InteractionApplicationCommand {
+			if i.ChannelID != discordChannelId {
+				s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+					Type: discordgo.InteractionResponseChannelMessageWithSource,
+					Data: &discordgo.InteractionResponseData{
+						Content: "使うチャンネルを間違ってますよ。",
+					},
+				})
+			}
 			roles, _ := s.GuildRoles(i.GuildID)
 			var discordWaintingRoleId string
 			for _, role := range roles {