diff --git a/internal/auth/auth.go b/internal/auth/auth.go
index a85b081..bb36eed 100644
--- a/internal/auth/auth.go
+++ b/internal/auth/auth.go
@@ -31,7 +31,7 @@ func (a *Authenticater) GenerateCookie() (*http.Cookie, error) {
 		Name:  "token",
 		Value: v,
 	}
-	slog.Info("generate cookie", "value", v)
+
 	err := a.AuthStore.InsertCookieValue(v)
 	if err != nil {
 		slog.Error("failed to store new cookie", "err", err)
@@ -46,7 +46,6 @@ func (a *Authenticater) IsValidCookie(r *http.Request) (ok bool, err error) {
 	if err != nil {
 		// unknown error: http: named cookie not present
 		// token の key がない場合もここに落ちるので、この場合は ok = false とする
-		slog.Info("undetected cookie: token")
 		return false, nil
 	}
 	v := token.Value
diff --git a/internal/server/proxy.go b/internal/server/proxy.go
index 2af1b8a..1233337 100644
--- a/internal/server/proxy.go
+++ b/internal/server/proxy.go
@@ -73,6 +73,7 @@ func (s *Server) proxyMain(w http.ResponseWriter, r *http.Request) (resultCode P
 			return ProxyResultInternalError
 		}
 		http.SetCookie(w, cookie)
+		slog.Info("generate cookie", "request_id", reqId)
 	}
 
 	respBody := []byte("")