An outdoor unit of a refrigeration cycle apparatus includes a first header pipe and a second header pipe. The first header pipe and the second header pipe are connected to a heat-source-side heat exchanger. The outdoor unit further includes a refrigerant distributor pipe. The refrigerant distributor includes an inflow pipe into which refrigerant discharged from a compressor flows, a splitter pipe connected to the inflow pipe, a first feed pipe connected to the splitter pipe and to a first body portion of a first main pipe of the first header pipe, and a second feed pipe connected to the splitter pipe and to a second body portion of a second main pipe of the second header pipe.