An ultrasonic probe is provided and includes: an ultrasonic transmission and reception unit, being provided inside a housing； an acoustic transmission medium, being sealed in the housing； and a drive device for oscillating the ultrasonic transmission and reception unit. The housing is an injection-molded article by plastic material, and has a container shape with an opening in one direction. The container shape includes: a bottom surface portion through which ultrasonic waves transmit, and a peripheral portion being engaged with a probe body. The housing is injection-molded by providing the peripheral portion having a thickness thicker than a thickness of the bottom surface portion, providing a vertical groove parallel to a direction of mold release at a part of the peripheral portion； and providing a gate for flowing a molten resin at the peripheral portion apart from the vertical groove.
