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An air-intake duct, which is disposed between an air outlet of an air cleaner box constituting an air cleaner and an air inlet of a throttle body constituting a throttle device, is configured to guide air cleaned by the air cleaner to the throttle device. The air-intake duct includes a tubular coupl

An air-intake duct, which is disposed between an air outlet of an air cleaner box constituting an air cleaner and an air inlet of a throttle body constituting a throttle device, is configured to guide air cleaned by the air cleaner to the throttle device. The air-intake duct includes a tubular coupling member including an upstream coupling portion coupled in an air tight manner to the air outlet of the air cleaner box and a downstream coupling portion air-tightly coupled to the air inlet of the throttle body, the coupling member being entirely formed of an elastic rubber material. The air-intake duct also includes an air guide member including a first air inlet configured to take in air therethrough from inside the air cleaner box, a first air outlet configured to discharge the air therethrough toward the throttle body, and a fitting portion fitted to the coupling member.

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1. 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

1. 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; andan 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, whereinthe 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; anda 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. 2. An air-intake structure provided between a plurality of air outlets of an air cleaner box constituting an air cleaner and a plurality of air inlets of a throttle body constituting a throttle device and including an air-intake duct structure configured to guide air cleaned by the air cleaner to the throttle device, the air-intake duct structure comprising: a plurality of tubular coupling members including upstream coupling portions coupled in an air tight manner to the air outlets, respectively, and downstream coupling portions coupled in an air tight manner to the air inlets, respectively, the tubular coupling members being entirely formed of an elastic rubber material;a plurality of air guide members including first air inlets configured to take in the air therethrough from inside of the air cleaner box, first air outlets configured to discharge the air therethrough toward the throttle body, and fitting portions fitted to the coupling members, respectively;a coupling portion for coupling a plurality of air guide members to each other to constitute an air guide unit; andat least one fastening member configured to fasten the air guide unit to the air cleaner box;wherein a plurality of injectors having injection ports for injecting a fuel are provided inside of the air cleaner box to correspond to the plurality of air guide members, respectively; andthe first air inlets are disposed to face the injection ports, respectively.