Abstract: An ultrasonic cleaner includes a body section; a vibration generator mounted in the body section and having a vibration-transmitting portion formed at its front end for transmitting vibration to an object to be cleaned; and a cleaning-medium feed section for feeding a cleaning medium to the object to be cleaned. The vibration-transmitting portion is pressed against an object to be cleaned to thereby transmit vibration to the object to be cleaned, and a cleaning medium is fed to the object to be cleaned. Thus, vibration causes adhering dirt to be eluted into the cleaning medium from the object to be cleaned, thereby removing dirt from the object.