The present invention relates to an air cleaner device for a scooter-type vehicle. The object of the present invention is to provide an air cleaner for a scooter-type vehicle, which is effective to eliminate invasion of dust ash and leakage of suction sound, even when an air intake port of the air cleaner is arranged at a position out of protection of the vehicle body cover. The solution of the present invention is that, without a specific bracket, an air intake port cover 140 is arranged to straddle between a power unit 23 and an air cleaner 132 to indicate completeness of mounting. In addition, a cover unit 142 of the air intake port cover 140 is fitted to a recess 136, so that the cover unit 142 is aligned in flush with a case 135 of the air cleaner 132, thereby providing a preferable appearance. The air intake port cover 140 that is originally provided to cover a cooling-air suction port 23a of the power unit 23 is used also to cover an air intake port 133 of the air cleaner 132. As a consequence, even when the air intake port 133 of the air cleaner is disposed at a position out of the protection of the vehicle body cover, invasion of dust ash and leakage of suction sound can be prevented simultaneously.