<p>An outdoor unit of an air-conditioner is provided to manipulate a control box without separating a cabinet like a front panel by forming a service window connected to the control box in the front panel and prevent the lost of a service cover in the separation of the service cover by connecting of the service cover to a dropping prevention member. An outdoor unit of an air-conditioner comprises: a front panel(212) forming the outer shape of a front side; and a control box(500) which is installed at the rear of the front panel and has a plurality of electric parts. A service window(510) is formed in the front panel and facilitates the manipulation of the control box in the front outside.</p>
