Ultrasonic generator

An ultrasonic generator comprising:

• an ultrasonic wave generation source that generates an ultrasonic wave;
• an ultrasonic wave converging portion that converges the ultrasonic wave generated from the ultrasonic wave generation source;
• and
• a waveguide that transmits the ultrasonic wave converged by the ultrasonic wave converging portion,
• the ultrasonic wave converging portion including
• a first reflecting surface that reflects the ultrasonic wave generated at the ultrasonic wave generation source, and
• a second reflecting surface that reflects the ultrasonic wave reflected by the first reflecting surface,
• the first reflecting surface and the second reflecting surface being arranged such that the ultrasonic wave reflected by the second reflecting surface as a plane wave is introduced into the waveguide, wherein
• the waveguide includes a first shaft portion extending from the ultrasonic wave converging portion to one side in a predetermined direction, a second shaft portion disposed on the one side in the predetermined direction relative to the first shaft portion and extending in the predetermined direction, and a jutting out portion provided between the first shaft portion and the second shaft portion in the predetermined direction, and
• the jutting out portion juts out more outward than outer circumferential surfaces of the first shaft portion and the second shaft portion in a plane direction orthogonal to the predetermined direction.