To provide an image diagnostic device capable of recognizing a detailed tomogram on the surface of tissue and infiltration states into surrounding organs.

An ultrasonic probe 20 is constituted of an ultrasonic probe body 25 formed by disposing a vibrator unit 23 provided with an ultrasonic vibrator (non-illustration) to be an ultrasonic transmitting/receiving part at a probe tip part 22 of a long and narrow probe inserting part 21 with flexibility and a coil shaft 24 which is connected and fixed with/to the vibrator unit 23 at one end, is fixed to a driving unit for rotation, advancing and retreating at the other end, is long and narrow, transmits driving force for rotation in the arrow (a) direction and is freely movable forward and backward in the arrows (b), (c) directions, and an outer sheath 27 provided with a pipe-shaped inserting part 26 which has hollow with the inserted ultrasonic probe body 25, has flexibility and is sealed at a tip. On the tip part side of the inserting part 26 within an advancing/retreating range of the probe tip part 22, magnetic resonance image making parts 29a, 29b, 29c detectable by an MR device 3 are provided at three portions.