Outboard motor

An outboard motor (1) with an undercover (20) forming a part of an engine space (12) is provided. The undercover includes a left lower cover (21) and a right lower cover (31). The left and right lower covers are made from resin. To prevent the undercover from affecting the appearance, a plurality of resin reinforcing frame members (22, 23, 32, 33, 25, 26, 27, 28, 35, 36, 38) is integrally fixed to inside surfaces (21k, 31k) of the left and right lower covers.