A notification device is provided which decreases notifications that passengers find annoying. This notification device is provided with: a notification unit which detects an object that is approaching the vehicle and notifies a passenger of the approach of said object; a water detection unit which detects water present around the vehicle; and a notification control unit which controls the notification unit such that in the case that water has been detected by the water detection unit, the frequency of notifications is suppressed more than in the case that water is not detected.