To cure a layer of curable material for building more uniformly and appropriately at the time of building an object. A building apparatus that builds an object using a curable material that is cured by being irradiated with an ultraviolet ray, the building apparatus including: an ink-jet head serving as an ejection head that ejects a curable material for building; a UV light source that emits the ultraviolet ray to the curable material ejected from the ink-jet head; and a light source driver that supplies electric power for driving the UV light source. The UV light source is a UV LED, and the light source driver supplies electric power that varies in a pulse-like form to the UV light source to drive the UV light source using a pulse driving scheme.