Abstract: A washing device including a motor having a rotating shaft attachment with a projection, and a washing member and core member fitted to the rotating shaft attachment. The washing member has a through hole for receiving the rotating shaft attachment, and the core member is disposed in the through hole. The core member has a through hole for receiving the rotating shaft attachment and engagement recesses, each of which is engageable with the projection. A mounting device for the washing device includes a pedestal on which the washing device is mounted, a first support member having horizontal and vertical portions that receive the pedestal for rotation about its axis, a second support member having a receiving portion for receiving the vertical or horizontal portions of the first support member, and a third support member for supporting the second supporting member on a sink.