Abstract: An apparatus for producing a three-dimensional object by hardening a photocuring material includes a radiation source unit having a radiation source for emitting light, a receiving device having a receiving surface for receiving the photocuring material in liquid form, a carrier plate for receiving the photocuring material in a cured form, said carrier plate being movable relative to the receiving device, and a deflection device for deflecting the light emerging from the radiation source onto the carrier plate. The deflection device has at least one totally reflecting optical element, wherein the light emerging from the radiation source unit is totally reflected at least twice overall by the at least one optical element. A compact configuration of the apparatus can be achieved as a result.