To provide an imaging device in which thinning is achieved while a bent system imaging lens system is included.

A holding plate 42 includes rectangular apertures 42a to 42c that avoid interference with at least one member disposed in an optical path between a first lens group L1 at the most object side in an imaging lens system and an image pickup device CCD or around the optical path. Therefore, by performing assembling so that the member is embedded in the rectangular apertures, the thickness of the imaging device 10 can be thinned further than when the holding plate 42 does not include the rectangular apertures 42a to 42c.