PURPOSE: To obtain a molded body having a prescribed pattern easily and at a low cost by using a lens on the occasion of forming the pattern on a photosensitive resin.

CONSTITUTION: When a photosensitive resin is laminated on the rear of a lens and an active light beam is cast thereon as vertical parallel light beams from the surface of the lens, the light beams are made an active light beam flux 5 by a converging operation of the lens and irradiate a photosensitive resin layer 2, and the photosensitive resin in the part struck by the light beam flux is set selectively and forms a projecting part 6. Then, an unset part 7 of the photosensitive resin not being struck by the light beam flux is washed away by a spray or removed by a brush according to an ordinary method. A recessed part 7 of a photosensitive resin pattern thus formed is filled up with a black ink or black paint or colored with a black dye and thereby light-absorbing stripes 8 are formed.