To make quick and smooth insertion guidance of an ultrasonic probe performable via a simple structure by integrally providing the ultrasonic probe with a guide wire passing part and a supply path for a contrast medium and the like.

A flexible cord 2 constituting the ultrasonic probe 1 has two internally bored passing holes 3 and 4. The first passing hole 3 connectedly has a point cap 5 at the point. The point cap 5 houses an ultrasonic transducer 6, which is moved for scanning in a rotational direction by a flexible shaft 9 passed in the first passing hole 3. The second passing hole 4 has an open point and has a base end connected with a supply part unit 32. The connection part unit 32 comprises a connection part 33 in which a guide wire 41 is inserted, and a connection part 34 for a supply means for a contrast medium and the like. The guide wire 41 is passed in a wire loop 14 provided on the point cap 5.