Abstract: Manufacture of molded cases of various types is not required even if the molded cases house different numbers of substrates, so that cost of manufacturing camera modules with various functions is reduced. A camera module includes an optical system holder composed of a substrate supporting part in the form of a square box with a down-facing opening, and a cylindrical lens unit fixing part provided integrally with the substrate supporting part and formed at the center of the top of the substrate supporting part. A lens unit is supported in the lens unit fixing part, and an image capturing element holding substrate on which an image capturing element is placed is fixed in the substrate supporting part. A substrate holder is coupled to an end portion of the substrate supporting part of the optical system holder, and a circuit component holding substrate is supported in the substrate holder.