A probe insertable into a body lumen comprising: a cylindrical housing in which an ultrasonic wave transmitting and receiving unit to transmit and receive an ultrasonic wave and a light transmitting and receiving unit for optical coherence tomography (OCT) to transmit and receive a light are arranged, wherein the probe transfers a signal to an imaging apparatus for diagnosis generating an ultrasonic wave tomographic image and a light tomographic image based on the signal obtained by transmitting and receiving the ultrasonic wave and the light in a state where the housing rotates to move inside a body lumen in an axial direction, wherein an opening portion for the ultrasonic wave transmitting and receiving unit and the light transmitting and receiving unit to transmit and receive the ultrasonic wave and the light is provided on an upper side of the cylindrical surface of the housing , wherein the ultrasonic wave transmitting and receiving unit is arranged on a distal side in the axial direction and the light transmitting and receiving unit is arranged on a proximal side in the axial direction respectively in the housing , and wherein two signal wires of which one ends are connected to the ultrasonic wave transmitting and receiving unit and extending to the outside of the housing toward the proximal side in the axial direction substantially parallel to each other are arranged in the housing and below the light transmitting and receiving unit so as to cause the distance between the two signal wires to be smaller than a width of an optical element configuring the light transmitting and receiving unit . a cylindrical housing in which an ultrasonic wave transmitting and receiving unit to transmit and receive an ultrasonic wave and a light transmitting and receiving unit for optical coherence tomography (OCT) to transmit and receive a light are arranged, wherein the probe transfers a signal to an imaging apparatus for diagnosis generating an ultrasonic wave tomographic image and a light tomographic image based on the signal obtained by transmitting and receiving the ultrasonic wave and the light in a state where the housing rotates to move inside a body lumen in an axial direction, wherein an opening portion for the ultrasonic wave transmitting and receiving unit and the light transmitting and receiving unit to transmit and receive the ultrasonic wave and the light is provided on an upper side of the cylindrical surface of the housing , wherein the ultrasonic wave transmitting and receiving unit is arranged on a distal side in the axial direction and the light transmitting and receiving unit is arranged on a proximal side in the axial direction respectively in the housing , and wherein two signal wires of which one ends are connected to the ultrasonic wave transmitting and receiving unit and extending to the outside of the housing toward the proximal side in the axial direction substantially parallel to each other are arranged in the housing and below the light transmitting and receiving unit so as to cause the distance between the two signal wires to be smaller than a width of an optical element configuring the light transmitting and receiving unit . <EOS>