Air cleaner system for motorcycle

The invention provides an air cleaner having a large capacity and disposed under a fuel tank without changing the capacity and mounting height of the fuel tank. The air cleaner (21) is disposed under a fuel tank in such a manner as to be housed in a space surrounded by a head box (1) and right and left main frames. Independent air cleaner elements (23,24) are disposed in parallel in the air cleaner (21) and are connected to independent intake passages (A,B), respectively. The intake passages (A,B) form a dirty room formed in a front portion of a case main body (26), and are disposed on the left and right sides of water drip walls (25) integrally formed on the bottom of the case main body (26). The right and left water drip walls (25) are each formed into an approximately V-shape in a plan view and project in the intake passages.