Disclosed is a personal watercraft capable of preventing oil flow from an engine to a breather device. The personal watercraft comprises: a four-cycle engine; a water jet pump driven by the engine, the water jet pump pressurizing and accelerating water taken in from outside of the watercraft and ejecting the water from the outlet port to propel the watercraft as a reaction of the ejecting water; a breather pipe configured such that a base end is connected to the engine to communicate with an inside of the engine, an intermediate portion is located lower than the base end, and a tip end is located higher than the base end; and a breather box, wherein the tip end of the breather pipe communicates with inside of the breather box and the base end of the breather pipe is located lower than the breather box.