To obtain sufficient exposure for a subject having low luminance at low cost by making the open F-number of a photographing lens satisfy a specified condition.

This photographing lens is constituted of two lens components and a diaphragm, and satisfies 5.6<F0<8 when it is assumed that the open F-number of the photographing lens is F0. A photographic image plane frame 24 exists nearly in the center of a main body 10, and an unexposed film chamber 22 is arranged on either side and an exposed film chamber 23 is arranged on the other side while putting the frame 24 in between. The photographing lens 11A exists nearly in the center of the main body, and a shutter 19 is provided on the frame 24 side of the lens. A 2nd diaphragm plate AP2 is provided between the lens 11A and the shutter 19, and apertures AP21 and AP22 are provided on the plate AP2. A 1st diaphragm plate AP1 is installed between two lenses of the lens 11A. The lens 11A is a plastic lens constituted so that the refractive index of two lens components on a d-line is ≤1.6, for example.