A straddle type vehicle comprising an air cleaner apparatus, said air cleaner apparatus comprising: an air cleaner case whose inside is divided into an unpurified chamber and a purified chamber by an air cleaner element; an intake duct attached to said air cleaner case so as to communicate with said unpurified chamber, simultaneously provided with an air inlet opening directing the front direction; a cover member attached to the outside surface of said air cleaner case in the width direction of the vehicle, simultaneously forming an intake passage between said air cleaner case and the cover member, and covering the air inlet opening, and a cleaner apparatus wherein said cover member extends in the longitudinal direction of the vehicle such that the longitudinal length becomes longer than the vertical length, said air inlet opening is positioned further frontward than the longitudinal center of said air cleaner case, an air inlet to said intake passage is formed further rearward than the longitudinal center of said air cleaner case as well as on the rear portion of said cover member, wherein said straddle type vehicle has a power unit swingably supported on a body frame, said power unit has a transmission case continuously provided to a crank case of an engine E and extended from said crank case to the rear direction, said air cleaner case is disposed above said transmission case, characterized in a projecting portion projecting from said air cleaner case to the outside in the width direction of the vehicle is disposed in the rear and upper direction of said air inlet to suppress the water, foreign materials and the like entering the air inlet from above the vehicle, and in that a passage forming portion is formed with said air cleaner case and said cover member so as to surround said intake passage, and a lower portion of said passage forming portion is inclined so as to be positioned further downward as it approaches to the rear side. an air cleaner case whose inside is divided into an unpurified chamber and a purified chamber by an air cleaner element; an intake duct attached to said air cleaner case so as to communicate with said unpurified chamber, simultaneously provided with an air inlet opening directing the front direction; a cover member attached to the outside surface of said air cleaner case in the width direction of the vehicle, simultaneously forming an intake passage between said air cleaner case and the cover member, and covering the air inlet opening, and a cleaner apparatus wherein said cover member extends in the longitudinal direction of the vehicle such that the longitudinal length becomes longer than the vertical length, said air inlet opening is positioned further frontward than the longitudinal center of said air cleaner case, an air inlet to said intake passage is formed further rearward than the longitudinal center of said air cleaner case as well as on the rear portion of said cover member, wherein said straddle type vehicle has a power unit swingably supported on a body frame, said power unit has a transmission case continuously provided to a crank case of an engine E and extended from said crank case to the rear direction, said air cleaner case is disposed above said transmission case, characterized in a projecting portion projecting from said air cleaner case to the outside in the width direction of the vehicle is disposed in the rear and upper direction of said air inlet to suppress the water, foreign materials and the like entering the air inlet from above the vehicle, and in that a passage forming portion is formed with said air cleaner case and said cover member so as to surround said intake passage, and a lower portion of said passage forming portion is inclined so as to be positioned further downward as it approaches to the rear side.