An outdoor unit is configured so that: the side surfaces on the outer contours are formed using a plurality of panels provided with an air-suction port through which air from outside the outdoor unit is drawn in, at least one of the plurality of panels being a service panel; and a heat-source-side heat exchanger is divided, in plurality, into a first heat-source-side heat exchanger that is provided along a side surface including the service panel and a second heat-source-side heat exchanger that is provided along a side surface different from the side surface including the service panel. In the first heat-source-side heat exchanger, the channel of the coolant lies parallel to the air flow during air-warming operation. According to the present invention, it is possible to suppress splashing of drain water on the service panel provided in the casing of the outdoor unit, and to prevent the drain water from freezing.
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