To obtain a film unit with a lens capable of keeping light shielding ability on the inside of a main body part and preventing optical fogging from occurring on photographic film even when a transparent front cover is used.

A light shielding rib 59a extended toward the vicinity of the front end of a dark box is integrally formed on the periphery of a lens holder 59. The rib 59a covers a shutter blade 57 and the armature part 42a of a synchro switch 42 arranged at the rear of the lens holder 59 to surround. The side surface of a space where the blade 57 is turned between the lens holder 59 and the dark box is shielding from light by the rib 59a.