A solid-state image sensor includes a first image sensing device, a first flexible substrate connected to the first image sensing device, a second solid-state image sensing device, and a second flexible substrate connected to the second solid-state image sensing device. The solid-state image sensing devices are disposed adjacently to each other such that light receiving surfaces are perpendicular to each other. The second solid-state image sensing device directly receives incident light. However, the first solid-state image sensing device receives the incident light reflected by a mirror. Electronic components are mounted on the two flexible substrates. The first flexible substrate is bent at two bending positions to face the second flexible substrate and electrically connected thereto.