Laser heating control mechanism, laser heating control method, laser heating control program, and three-dimensional molding device

This laser heating control mechanism is for adjusting appropriate pre-heating and post-heating by a simple operation, in three-dimensional molding. Provided is a laser heating control mechanism (100) for pre-heating or post-heating an object to be heated (110), the laser heating control mechanism (100) being provided with: an optical fiber (101) that transmits and emits from an opening end face (101a) a laser beam; a collimating optical system (102) for focusing the laser beam emitted from the opening end face (101a) on the object to be heated (110); and an irradiation range adjustment mechanism (103) for adjusting the distance between the opening end face and the collimating optical system along the irradiation axis of the laser beam, such that the object to be heated (110) is irradiated by the laser beam with a prescribed beam diameter.