To provide a water discharge structure of an engine room of an outboard engine for smoothly discharging water entering the engine room of the outboard engine from the outside.

In the outboard engine, an outboard engine body comprising an engine, a propeller driven by the engine, a drive shaft to transmit the driving force to the propeller from the engine, a case means to support the engine and rotatably accommodate and support the drive shaft, and a cover to constitute at least a part of the engine room to accommodate the engine is fitted to a hull in a tiltable and steerable manner. The cover has a cover to constitute the engine room to accommodate the engine, and water discharge passages 61 and 71 communicating the inside of the cover with the outside of the cover. The water discharge passages have inlets 62 and 72 on the engine room side and outlets 63 and 73 to the outside of the engine room. The inlets and the outlets are separated from each other in the vertical direction, and arranged separately from each other in the horizontal direction.