The present invention discloses an outdoor unit for air conditioner, wherein, the top cover is supported by a fastener used for fastening heat exchanger, so that the distortion of the top cover can be prevented. The outdoor unit for air conditioner includes: the machine frame, which is provided with a top cover that arranged with plurality columns in the machine frame; a fastener, for fastening the top of the plurality of columns heat exchanger with each other; wherein the fastener includes a cover support part for supporting the undersurface of the top cover. |