A manufacturing method for a camera module including a multilayer body in which an image sensor IC and a lens are arranged with an optical path provided in the multilayer body being disposed therebetween includes a first step and a second step. In the first step, the multilayer body is formed by stacking and combining flexible sheets. In the second step, a through hole is formed in flexible base material layers that constitute a portion of the multilayer body to form the optical path defined by the through hole.