PURPOSE: To simplify a device and to form a three-dimensional shape effectively for a short period by controlling the exposure energy of laser beams irradiated on a liquid light-curing resin material by a photomodulator.

CONSTITUTION: A laser beam 22 radiated from a laser device 21 is modulated up to a prescribed light intensity by the photomodulator 24 on the basis of a three-dimensional shape information pattern signal stored in a signal control circuit 23, and then converted into a proper beam diameter through lenses 26, 27. The converted beam is polarized by a rotary polahedral mirror 28 controlled by a signal control circuit 23, scanned at a constant speed by an fθ lens 29 and then irradiated on a liquid light-curing resin material 32 filling the inside of a resin storing vessel 31. In this case, a supporting board 33 mounting the vessel 31 is also moved on the basis of the three-dimensional shape information pattern signal, so that the resin is selectively exposed and cured also in the depth direction in addition to the surface of the resin material 32.