In at least one embodiment of the disclosure, a projector comprises an optical element holding member that allows a flow of a cooling liquid therein. A plurality of liquid circulation members connect the optical element holding member and a liquid pumping unit and to define a flow channel of the cooling liquid. A heat-receiving jacket is disposed in the flow channel and has a plurality of flow channels. A thermoelectric conversion element having a heat-absorbing surface is connected to the heat-receiving jacket and a heat-radiating surface is connected to a heat transfer member. A supporting member fixes the heat-receiving jacket and the heat transfer member. A baffle member defines an internal space with the supporting member and houses the heat transfer member in the internal space. A cooling fan provides cooling air to the heat transfer member disposed in the internal space.