A thermoelectric generator module includes a first base material that is formed into a sheet and that has a thermoplastic layer, a second base material that is formed into a sheet and that has a thermoplastic layer, a plurality of thermoelectric conversion elements arranged between the first base material and the second base material, a plurality of first electrodes arranged between the first base material and the thermoelectric conversion elements, a plurality of second electrodes arranged between the second base material and the thermoelectric conversion elements, and a joint that joins the first base material to the second base material. The thermoelectric conversion elements, the plurality of first electrodes, and the plurality of second electrodes are sealed by the joint.