Provided is an art in which when an operator grips a probe (2) of an ultrasonic imaging apparatus (1) and moves the probe (2), it is facilitated to maintain the probe (2) at a suitable angle with respect to an object to be imaged. A probe adapter (3) may include a contact surface (33) having a shape extending along an outer circumference of a cross section of an object to be imaged, and a fixing portion (32) configured to fix a probe (2) having an ultrasonic wave transmitting-receiving surface (23) which transmits and receives an ultrasonic wave at a given angle and expose the ultrasonic wave transmitting-receiving surface (23) to the contact surface (33) side.
