A camera module 100 of the present invention is arranged such that a lens barrel 32 is provided with an internal screw thread 32a on its internal side, and that a holding section 41, which is a portion of a lens holder 4, the portion holding a lens unit 3, is provided with an external screw thread 41a on its external side, the external screw thread 41a being engaged with the internal screw thread 32a. As a result, it is possible to provide the camera module 100 capable of preventing contamination by dirt into a light path and thereby reducing imaging defects.