An electrical component mounting structure for a personal watercraft which simplifies a waterproof treatment of the electrical components. The structure includes an exhaust outlet of the exhaust pipe formed on one side of the body of the personal watercraft in a lateral direction. In this personal watercraft, a plurality of electrical components is disposed in the body so as to be offset on the one side from a central portion in the lateral direction. In other words, none of these electrical components is disposed in the vicinity of a wall surface on the other side of the body. The electrical components are preferably disposed in the body at an intermediate portion in the vertical direction, and at least one of a plurality of the electrical components is preferably mounted to a side wall constituting the one side of the body.