An image diagnostic apparatus having a plurality of transmitting and receiving unit, based on the distance difference or the circumferential direction of the angular difference in the axial direction between the transmission and reception unit, the generated tomographic image to be the position correction. The present invention uses an ultrasonic transmitting and receiving unit transmitting and receiving unit and the light receiving portion is disposed, a signal obtained by moving in the axial direction while rotating the lumen of the object to be measured, an ultrasonic an image diagnostic apparatus which generates a tomographic image and an optical tomographic image, the calibration jig having a reflecting portion generates the data for the ultrasound data and the optical tomographic image of the tomographic image for the generated for ultrasonic tomographic image and positional information of the reflection portion included in the data, based on the position information of the reflective portion included in the data for the generated optical tomography, between the ultrasonic transmitter-receiver and an optical transceiver, in about an axis It calculates an angular difference in the circumferential direction, characterized by using as the correction value for displaying an ultrasonic tomographic image or a tomographic image position correction to.