A refrigeration apparatus performs heat exchange on a water tube system having a water inlet tube leading exterior water to a water branching point, first and second branching water tubes extending from the water branching point, and a water outlet tube leading to the exterior from a convergent point of the first and second branching water tubes. Active refrigerant is in a supercritical state in at least part of a refrigeration cycle. The refrigeration apparatus includes a main expansion mechanism connected to an evaporator, first and second compression elements connected by a first refrigerant tube, a first heat exchanger exchanging heat between the first refrigerant tube and the first branching water tubes, second refrigerant tubes connecting the second compression element and the main expansion mechanism, and a second heat exchanger in which the second refrigerant tubes exchange heat with the second branching water tubes and does not exchange heat with the water inlet tube.