A probe holder (38) that has: a housing part (40) that houses one part of a probe head (34) of an ultrasonic probe and a belt (42) that, along with the housing part, binds the probe head from the outside. As a result of the belt (42) being fastened and binding the probe head (34), it becomes difficult for the probe head (34) to come out of the probe holder (38), and the probe head (34) is securely held.
