Provided is a thermoelectric converter capable of improving electric power generation performance with secured airtightness even if heat cycle is added; and improving the simplification of a structure, productivity, and reliability in device by decreasing the number of components. The thermoelectric device is provided with a metal substrate (2), a thermoelectric conversion element (3) loaded at the center of the surface of the metal substrate (2), a metal-made lid (4) that covers an upper surface and sides of the thermoelectric conversion element (3), and a metal-made bonding metal member (5) that hermetically seals the metal substrate (2) and the lid (4) in the periphery on the surface of the metal substrate (2).