A massaging device to be mounted in a hole of an inner wall of a bath, having a casing mountable in a watertight manner in the hole, a flexible member mounted in a watertight manner on the casing, the flexible member having a surface accessible to a user in the bath when the massaging device is mounted in the bath and an electrically operated vibrator mounted inside the casing, for vibrating the flexible member. A bath massaging system having massaging devices as described above.