a display module;

a lifting part disposed on a rear surface of the display module and connected to the display module; and

a drive belt connected to the lifting part and which moves in a first direction to extend and retract the lifting part in the first direction,

wherein the drive belt is deformable in a curved shape and moves along a guide groove defined in the lifting part,

the guide groove is open in the first direction,

the lifting part includes a plurality of support parts arranged in the first direction and coupled to move relative to each other in the first direction, and

the drive belt is connected to an uppermost support part among the plurality of support parts and is disposed in the guide groove defined in each of the plurality of support parts except for the uppermost support part.