It is possible to observe the same position in an imaging apparatus for diagnosis. According to the present invention, a probe includes a transmitting and receiving unit 221 in which an ultrasonic wave transmitting and receiving unit 310 and a light transmitting and receiving unit 320 are arranged. The ultrasonic wave transmitting and receiving unit 310 and the light transmitting and receiving unit 320 are arranged along an axial direction. A distance L [mm] between a position of the ultrasonic wave transmitting and receiving unit 310 in the axial direction and a position of the light transmitting and receiving unit 320 in the axial direction, and the angular difference ¸ [degrees] between a transmit direction of an ultrasonic wave of the ultrasonic wave transmitting and receiving unit 310 and a transmit direction of light of the light transmitting and receiving unit 320 satisfy a relationship of L = V/É × ¸/360 when having a rotary velocity É [r/s] of the transmitting and receiving unit 221 and a movement velocity V [mm/s] of the transmitting and receiving unit 221 in the axial direction.
