A scooter type motorcycle comprising: a rear wheel; a transmission case disposed sideward of the rear wheel; a V-belt type continuously variable transmission disposed in the transmission case; a first intake duct provided on the transmission case and including a first inlet positioned frontward relative to a vehicle fore-and-aft midpoint of the transmission case; an air cleaner case disposed above the transmission case; a second intake duct provided on the air cleaner case and including a second inlet positioned frontward relative to a vehicle fore-and-aft midpoint of the air cleaner case; an air cleaner case cover disposed laterally outward of the air cleaner case and the second intake duct; a transmission case cover disposed laterally outward of the transmission case and the first intake duct and disposed below the air cleaner case cover; and a partition plate disposed between the first inlet of the first intake duct and the second inlet of the second intake duct, and wherein: a side intake port for sucking air toward the first inlet is formed between the air cleaner case cover and the transmission case cover, and laterally outward of the first inlet, an area of an opening between the air cleaner case cover and the transmission case cover is larger than a minimum flow passage cross-sectional area of the first intake duct; and a rear intake port for sucking air toward the second inlet is formed between the air cleaner case cover and the transmission case cover, and rearward relative to the first inlet; and at least a portion of the rear intake port is disposed laterally inward relative to the side intake port, characterized in that a laterally extending plate member is provided in a portion of the transmission case cover that is rearward of the first intake duct; the air cleaner case cover includes a wall portion positioned behind the plate member and including a lower end positioned downward relative to an upper end of the plate member; and the plate member and the wall portion together form a labyrinth structure positioned rearward of the first intake duct. a rear wheel; a transmission case disposed sideward of the rear wheel; a V-belt type continuously variable transmission disposed in the transmission case; a first intake duct provided on the transmission case and including a first inlet positioned frontward relative to a vehicle fore-and-aft midpoint of the transmission case; an air cleaner case disposed above the transmission case; a second intake duct provided on the air cleaner case and including a second inlet positioned frontward relative to a vehicle fore-and-aft midpoint of the air cleaner case; an air cleaner case cover disposed laterally outward of the air cleaner case and the second intake duct; a transmission case cover disposed laterally outward of the transmission case and the first intake duct and disposed below the air cleaner case cover; and a partition plate disposed between the first inlet of the first intake duct and the second inlet of the second intake duct, and wherein: a side intake port for sucking air toward the first inlet is formed between the air cleaner case cover and the transmission case cover, and laterally outward of the first inlet, an area of an opening between the air cleaner case cover and the transmission case cover is larger than a minimum flow passage cross-sectional area of the first intake duct; and a rear intake port for sucking air toward the second inlet is formed between the air cleaner case cover and the transmission case cover, and rearward relative to the first inlet; and a side intake port for sucking air toward the first inlet is formed between the air cleaner case cover and the transmission case cover, and laterally outward of the first inlet, an area of an opening between the air cleaner case cover and the transmission case cover is larger than a minimum flow passage cross-sectional area of the first intake duct; and a rear intake port for sucking air toward the second inlet is formed between the air cleaner case cover and the transmission case cover, and rearward relative to the first inlet; and at least a portion of the rear intake port is disposed laterally inward relative to the side intake port, characterized in that a laterally extending plate member is provided in a portion of the transmission case cover that is rearward of the first intake duct; the air cleaner case cover includes a wall portion positioned behind the plate member and including a lower end positioned downward relative to an upper end of the plate member; and the plate member and the wall portion together form a labyrinth structure positioned rearward of the first intake duct.