Outboard motor

An outboard motor, comprising:

• an exterior cover;
• an engine room;
• an engine housed in said engine room formed by said exterior cover;
• an engine cover covering an upper portion of said outboard motor and having a protruding portion upwardly projecting from an upper surface thereof, said protruding portion being formed with an expansion chamber separating an inner space thereof from said engine room in which said engine is housed, and formed with an outside air inlet opened to face forward;
• a throttle body of said engine provided with an intake port;
• a throttle body coupling pipe, wherein said expansion chamber and said intake port of said throttle body are coupled by said throttle body coupling pipe;
• a protruding portion upwardly projecting from the upper surface of said engine cover, wherein said outside air inlet is provided at said protruding portion;
• a step between the upper surface of said engine cover and a bottom end edge of said outside air inlet, wherein the upper surface of said engine cover located anterior to said outside air inlet is inclined downward to a front;
• and
• a surrounding wall extending to a front around said outside air inlet.