PURPOSE: To provide a film unit with a lens for a multiocular stereoscopic photograph constituted so as to view an excellent stereoscopic photographic image on a photographic printing paper by making the relation of the F-number of a photographic lens mounted on the film unit with the lens and a focal distance and the smallest guide number of a built-in stroboscopic unit clear and further, the method of processing a stereoscopic photographic printing paper capable of stably viewing the stereoscopic photographic image on the printing paper over a long period of time.

CONSTITUTION: In the film unit with the lens for the multiocular stereoscopic photograph constituted so that a film is previously loaded, images A-C for composing a stereoscopic photograph on each film picture by each lens corresponding to it are photographed on the film pictures of plural frames arranged to be adjacent each other in the feeding direction of the film and then, the film after being photographed is successively rewound in a cartridge by the winding operation of a film winding knob, the relation of the F-number FNO of the lenses L1-L3 and the focal distance (f) satisfies FNO≥f2/120.