Air heat exchangers are composed of a first air heat exchanger through a fourth air heat exchanger, which are formed in a L shape, which include long side portions and short side portions in a state where one end portion sides in an extension direction of tubes, in which a coolant is flowed, are bent; and each of the short side portions is disposed at a short hand side of a rectangular shape, in such a way that an arrangement shape of the first air heat exchanger through the fourth air heat exchanger is formed as a frame shape having a rectangular shape viewed from a plane.