A heat conversion apparatus according to one embodiment of the present invention comprises: a duct through which cooling fluid passes; a first thermoelectric module disposed on a first surface of the duct; a second thermoelectric module disposed on a second surface, which is disposed in parallel to the first surface, of the duct; and a gas guide member disposed above a third surface disposed between the first surface and the second surface of the duct so as to be spaced from the third surface, wherein the gas guide member includes one end thereof coming in contact with the first thermoelectric module, the other end thereof coming in contact with the second thermoelectric module, and an extended part for connecting the one end and the other end, and the gas guide member can have a form in which the distance thereof from the third surface gradually increases toward the center between the one end and the other end.