In an air intake apparatus for a two-wheeled motor vehicle, a body frame of the vehicle includes a hollow head box and a pair of right and left hollow main frames extending rearwards from the right and left sides of the head box. An air intake duct is positioned in front of the head box, a front inlet of an air cleaner positioned behind the head box is connected to a rear outlet of the head box, and an inside of the head box is connected to insides of the mainframes. Preferably, insides of rear edges of the main frames communicate with each other through a hollow cross pipe.