A heat exchanger is provided with a heat exchange body through which fluid to be cooled passes, and a refrigerant passage which is provided to either the center section and/or the outer peripheral section of the heat exchange body and through which a refrigerant which exchanges heat with the heat exchange body flows. The heat exchange body is provided with a first heat transfer means which extends from the center section toward the outer peripheral section, and a second heat transfer means which extends in the circumferential direction and which intersects the first heat transfer means. The heat transfer efficiency of the first heat transfer means is higher than the heat transfer efficiency of the second heat transfer means. As a result of this configuration, heat can be efficiently transferred toward the refrigerant passage which is disposed at either the center section and/or the outer peripheral section. The satisfactory heat transfer characteristics of the heat exchanger can increase cooling efficiency.