Ultrasonic wave generation device

An ultrasonic wave generation device comprising:

• an ultrasonic wave generation source configured to generate an ultrasonic wave;
• an ultrasonic wave condensation part configured to condense the ultrasonic wave generated from the ultrasonic wave generation source;
• and
• a waveguide configured to allow transmission therethrough of the ultrasonic wave condensed by the ultrasonic wave condensation part, wherein
• the ultrasonic wave condensation part has a first reflection surface located to be opposed to the ultrasonic wave generation source and a second reflection surface located to be opposed to the first reflection surface,
• the first reflection surface reflects the ultrasonic wave, which has been generated from the ultrasonic wave generation source, toward the second reflection surface,
• the second reflection surface reflects the ultrasonic wave, which has been reflected by the first reflection surface, toward the waveguide so as to introduce the ultrasonic wave into the waveguide,
• the waveguide protrudes from the first reflection surface to a side opposite to the second reflection surface, and
• a recessed portion is formed to be recessed from the first reflection surface to the second reflection surface side along an outer circumferential surface of the waveguide.