Patent ID: 7549429

Claim:
An ultrasonic washer comprising: a housing having a main body and a nozzle unit; a water supply pipe for supplying washing to a cavity of said nozzle unit; an ultrasonic transducer contained in an inside of the main body of said housing and generating ultrasonic vibration; a driving circuit contained in the inside of the main body of said housing and driving said ultrasonic transducer; and an ultrasonic wave propagation member provided for protruding into the inside of said main body and into the cavity of said nozzle unit, said ultrasonic transducer being fixed to a portion thereof in said main body side, and directly propagating the ultrasonic vibration generated by the ultrasonic transducer to the washing supplied to the cavity of said nozzle unit from an end face thereof in said nozzle unit side, wherein said end face of the ultrasonic wave propagation member in said nozzle unit side is parallel to a joint face of the ultrasonic transducer and the ultrasonic wave propagation member, and a plurality of hemispherical or circular cone shaped concave portions are provided on said end face.