An imaging apparatus comprising: a probe unit provided with an imaging core including a transmitting and receiving unit which is configured to carry out signal transmission and reception continuously and obtain a reflection signal from the inside of a body cavity; a scanner and pull-back unit including a rotary joint, a rotary drive apparatus and a linear drive apparatus configured to move the transmitting and receiving unit in a longitudinal direction inside the body cavity while also rotating the transmitting and receiving unit; an image construction unit configured to generate for every rotation cycle of the transmitting and receiving unit cross-sectional images of the inside of the body cavity in the longitudinal direction based on the obtained reflection signal; a holding unit (329, 433, 539) configured to receive a plurality of X-ray images obtained by X-ray imaging of the transmitting and receiving unit inside the body cavity in an imaging cycle defined beforehand and hold the plurality of X-ray images; a first generation unit configured to generate a cross-sectional moving image from the cross-sectional images generated for every rotation cycle of the transmitting and receiving unit by setting the rotation cycle of the transmitting and receiving unit as a frame rate; a second generation unit configured for every rotation cycle of the transmitting and receiving unit to read out from the holding unit (329, 433, 539) the X-ray image obtained by X-ray imaging just previously to the timing of the rotation cycle and by using the read out X-ray images to generate an X-ray moving image by setting the rotation cycle of the transmitting and receiving unit as frame rate; and a display (327, 415, 517) configured to display the cross-sectional moving image and the X-ray moving image at the frame rate; characterized in that the second generation unit is configured when there exists no X-ray image obtained just previously to the timing of an rotation cyle to generate a frame of the X-ray moving image by interpolation using the X-ray image which was obtained at a previous imaging timing. a probe unit provided with an imaging core including a transmitting and receiving unit which is configured to carry out signal transmission and reception continuously and obtain a reflection signal from the inside of a body cavity; a scanner and pull-back unit including a rotary joint, a rotary drive apparatus and a linear drive apparatus configured to move the transmitting and receiving unit in a longitudinal direction inside the body cavity while also rotating the transmitting and receiving unit; an image construction unit configured to generate for every rotation cycle of the transmitting and receiving unit cross-sectional images of the inside of the body cavity in the longitudinal direction based on the obtained reflection signal; a holding unit (329, 433, 539) configured to receive a plurality of X-ray images obtained by X-ray imaging of the transmitting and receiving unit inside the body cavity in an imaging cycle defined beforehand and hold the plurality of X-ray images; a first generation unit configured to generate a cross-sectional moving image from the cross-sectional images generated for every rotation cycle of the transmitting and receiving unit by setting the rotation cycle of the transmitting and receiving unit as a frame rate; a second generation unit configured for every rotation cycle of the transmitting and receiving unit to read out from the holding unit (329, 433, 539) the X-ray image obtained by X-ray imaging just previously to the timing of the rotation cycle and by using the read out X-ray images to generate an X-ray moving image by setting the rotation cycle of the transmitting and receiving unit as frame rate; and a display (327, 415, 517) configured to display the cross-sectional moving image and the X-ray moving image at the frame rate; characterized in that the second generation unit is configured when there exists no X-ray image obtained just previously to the timing of an rotation cyle to generate a frame of the X-ray moving image by interpolation using the X-ray image which was obtained at a previous imaging timing.