A manifold incorporating a thermoelectric module having a wide contact of a heat medium with a heat transfer surface of the thermoelectric module and an excellent heat exchange efficiency, and a circular thermoelectric module easily manufactured and constructed into a multi-stacked structure. The manifold (1) comprises a cooling-side manifold piece (2), a heating-side manifold piece (3), a cooling-side agitating member (5), a heating-side agitating member (6), a thermoelectric module (7) and a motor member (8). Heat transfer surfaces (50, 51) of the thermoelectric module (7) are disposed vertically, so that if air enters the cavities (52, 55), air rises along the heat transfer surfaces (50, 51) and exhausted from the exhaust ports (22, 43) at the top of the manifold (1). The cooling-side agitating member (5) and the heating-side agitating member (6) are provided with permanent magnets (33), so that the cooling-side agitating member (5) receives a driving force from the heating-side agitating member (6) and is rotated. A square thermoelectric module (11) is held between aluminium disks (12,13) to form a circular thermoelectric module (10).