An outdoor device of an air conditioner is provided and may include a top cover that forms an upper surface of the outdoor device and provided with at least one discharge port through which air may be discharged, at least one fan provided under the top cover, and at least one shroud that accommodates the fan and that connects with the discharge port. A transverse width of the at least one shroud that passes through side surfaces of the at least one shroud and the at least one fan may be constant from an inlet port of the shroud to an outlet part. A cross sectional area of the outlet port may gradually increase toward the at least one discharge port.