A sintering apparatus is provided. The sintering apparatus includes a case having an internal space formed therein and including a door provided in a front portion thereof to open and close the internal space, a magnetron coupled to the case and oscillating microwaves toward the internal space, a heat insulating unit disposed in the internal space to form a chamber space and blocking transmission of heat of the chamber space to the internal space, a susceptor unit disposed in the chamber space and having a sintering space in which a to-be-sintered material is accommodated, and a cooling unit cooling at least one of the case or the chamber space.