An imaging module includes: a hollow lens holder open at both ends; a lens assembled in the lens holder and collecting light input from one end of the lens holder; a hollow imaging holder having an opening into which the light output from the lens is input; an optical member assembled in the imaging holder and transmitting or deflecting the light input from one end of the imaging holder; and an image sensor assembled in the imaging holder and having a light-receiving region configured to receive the light transmitted or deflected by the optical member and to perform photoelectric conversion of the received light, wherein an optical axis center of the lens and a center of the light received by the light-receiving region of the image sensor are aligned with each other by fitting a light-output-side end portion of the lens holder and the imaging holder to each other.