To provide a focus detecting module capable of reducing the number of parts by using parts inside the module in common.

This focus detecting sensor module 30 is constituted by arraying a transparent visual field mask 31, a condenser lens 32, a mirror unit 33, an auxiliary lens 34, a mask plate 35, a separator lens 36, and a CCD sensor unit 37 in order from a sub mirror side where light is made incident. The lens 32 is an integrally molded element in which three lens parts 32a, 32b, and 32c are formed on a surface on the unit 33 side, and a surface on a visual field mask 31 side is constituted as a single plane. Infrared cut coating C is performed on the plane of the lens 32.