PURPOSE: To execute sure exposure and printing between a photosensitive material holder and original holder by constituting a titled composer in such a manner that plural hollow-shaped pin guide flanges adapted to an elastic plate of the photosensitive material holder at a prescribed spacing therefrom are finely moved in forward and backward directions and pins can be plunged into and ejected out of the hollow parts of said pin guide flanges.

CONSTITUTION: The original holder 12 and the photosensitive material holder 15 are horizontally turned and an original is supported on the surface of a light transmittable glass plate 14 of the original holder 12. A photosensitive material 27 is supported on the surface of the photosensitive material holder 15. Since the pins 3 and the holes 28 of the photosensitive material 27 are determined in positional relation, the photosensitive material 27 is surely and easily supported at the prescribed point of the photosensitive material holder 15. The pin guide flanges 19 move forward and backward together with the elastic plate 17 according to vacuum pressures and the photosensitive material 27 is held in place between the holder 12 and the holder 15 without generating a difference in height between the plate 17 and the flanges 19 and without being strained. The original and the material 27 are held in place between the holder 12 and the holder 15 and after the spacing between both is evacuated, the photosensitive material is exposed and printed.