A water-jet propulsion personal watercraft is disclosed, comprising a body formed by a hull and a deck covering the hull from above, the body having a joint portion joining the hull and the deck joined to each other at peripheries thereof, the body being configured to accommodate an engine configured to drive a propulsion system of the watercraft, and a side bumper mounted to the joint portion at a side portion of the body, wherein the side bumper includes a base portion mounted to the joint portion to extend along the joint portion in a longitudinal direction of the watercraft, and a protruding portion configured to extend along the base portion in the longitudinal direction and to protrude downward from a lower surface of the base portion to be spaced apart from a side wall of the hull.