Patent ID: 8216010

Claim:
An outboard motor comprising: an engine including a cylinder body and a cylinder head that are aligned in a front/rear direction; a catalyst housed inside the engine; and a catalyst housing portion provided at a side portion of the cylinder head; wherein the engine includes an exhaust port provided in the cylinder head, a first exhaust passage to guide exhaust discharged from the exhaust port into an interior of the catalyst housing portion, and a second exhaust passage that receives the exhaust that has passed through the interior of the catalyst housing portion; the catalyst is housed inside the engine such that at least a portion of the catalyst is housed in the interior of the catalyst housing portion; the first exhaust passage is surrounded by a cooling water passage to which water outside the outboard motor is supplied; and a drain passage is connected to the first exhaust passage at a location that is upstream of the catalyst and downstream of the exhaust port.