Patent ID: 8522741

Claim:
An air-intake duct configured to guide air in a first space defined by an air cleaner box constituting an air cleaner to a second space defined by a throttle body constituting a throttle device, comprising: a tubular coupling member disposed in a space between the first space and the second space to couple an air outlet of the air cleaner box to an air inlet of the throttle body; and an air guide member provided separately from the coupling member and disposed in the first space to guide the air flowing through inside of the air cleaner to the coupling member, wherein the coupling member has a stepped portion on at least a portion of an inner peripheral surface thereof, at least a portion of a downstream end surface of the air guide member being engageable with the stepped portion; a downstream end portion of the air guide member is fitted to a portion of the inner peripheral surface of the coupling member which is located upstream of the stepped portion; and a portion of the inner peripheral surface of the coupling member which is located downstream of the stepped portion is continuous with an inner surface of the air guide member without a level difference.