A thermoelectric transducer apparatus comprises a group of thermoelectric elements having N-type elements and P-type elements alternately arranged in a single line and a number of alternately arranged heat-absorbing-type and heat-liberating-type plate electrodes to electrically and serially connect said N- and P-type elements. Each of said heat-absorbing-type plate electrodes is extended to form a pair of integral heat-absorbing heat exchanger plates projecting in a direction from said group of elements, said pair of heat-absorbing heat exchanger plates having a pair of first plane areas extending in parallel with the group of elements and oppositely from each other and a pair of second plane areas extending from the respective first plane areas to leave the groups of elements, the outer surface of each of said second plane areas of each heat-absorbing heat exchanger plate being respectively bonded to the adjacent second plane areas of the neighboring heat-absorbing heat exchanger plates by means of insulating adhesive agent. Each of said heat-liberating-type plate electrodes has a pair of first plane areas and a pair of second plane areas all similar to those of each heat-absorbing p-type plate electrode. First and second partition walls for separating the cooled and coolant fluids of the thermoelectric transducer apparatus are formed by serially connecting the first plane areas of said heat-absorbing heat exchanger plates and those of said heat-liberating heat exchanger plates.