An ultrasonic nebulizer includes a working tank configured to be detachable with respect to a main body. The working tank includes a rod-shaped tank-side contact electrode that extends in a vertical direction along an outer wall of the working tank. A specific portion that corresponds to a portion in a circumferential direction of the outer circumferential surface of the tank-side contact electrode is exposed from the outer wall, and the remaining portion of the outer circumferential surface of the tank-side contact electrode is embedded inside of the outer wall and is connected to an electrode of an ultrasonic vibrator. A main body-side contact electrode comes into contact with the specific portion of the outer circumferential surface of the tank-side contact electrode when the working tank is mounted on the main body.