An imaging module 15 according to the present invention is disclosed wherein an imaging holder 31 is fitted into a lens holder 21, and the position of a light-output-side end portion of the lens holder 21 is defined by an outer circumferential surface 31c of the imaging holder 31 such that the center C3 of a lens 22 and a point C2, which is the center of a reference region, are positioned on the same axis L1, the reference region being a region of a light-input surface 34a of a prism 34, and into which the light to be received by a light-receiving region 33a of an image sensor 33 is input. Consequently, an optical axis center of an optical member of the lens unit 20 and the center of the light to be received by the light-receiving region 33a of the image sensor 33 of the imaging unit 30 can be aligned with each other by simply fitting the light-output-side end portion of the lens holder 21 and a light-input-side end portion of the imaging holder 31 to each other.
