The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and its manufacturing method. The ultrasonic cleaning apparatus is characterized by a control device adapted to detect the ultrasonic wave emission surface being in contact or in close proximity to an object and to stop the operation of the ultrasonic transducer upon detection of the ultrasonic wave emission surface not being in contact or in close proximity to the object. A first rebar extends through the channel.