To provide a film unit with a lens constituted to enable a photographer to recognize that the film unit damaged under a high-temperature environment when the film unit is rested under conditions of a specified temperature or above.

An exterior label 3 covering at least part of the outer peripheral surface of a unit body 2 is printed with warning sentences or the patterns, etc., corresponding thereto by ink which has irreversibility and has the characteristics to develop the color visible by the photographer, unlike the exterior label 3, when the camera unit is rested under the conditions of the specified temperature or above. When the label is printed with transparent ink, the printing in superposition on an exterior body printed with characters of an instruction manual, etc., or marks, etc., by ordinary ink is possible.