A personal watercraft includes a saddle ride type seat provided at a roughly central portion of a watercraft body, an engine mounted on the lower side of the seat and directed in a front-rear direction of the watercraft body, and cylinders provided in the engine are arranged in the front-rear direction of the watercraft body. First to fourth intake pipes communicated with the cylinders are extended from a side surface of the engine, and an air box containing the intake pipes is provided in a space between the engine and a left side wall. The air box includes a box main body and a cover body, and the cover body is disposed facing toward the left side wall. The left side wall facing toward the cover body is provided with an opening, and a side cover is provided to be capable of being fitted to and detached from the opening. Maintenance or inspection of intake system equipment can be easily carried out with the aforementioned personal watercraft.