Outdoor unit for air-conditioning apparatus

Provided is an outdoor unit for an air-conditioning apparatus having high reliability. A protective net disposed over an air inlet at a rear surface of a casing includes a frame body defining an outer periphery of the protective net, and a plurality of vertical bars and a plurality of horizontal bars crossing each other inside the frame body and defining a plurality of ventilation openings. Each horizontal bar has an upper surface having a downwardly open V-shape in vertical cross-section formed by combining a rear upper surface inclined downward and rearward and a front upper surfaced inclined downward and forward. When it snows, snow on the horizontal bar slides off a downward slope without freezing into ice on the horizontal bar. Accordingly, a reduction in an opening area of the ventilation openings due to ice does not occur.