A thrust receiver abuts against an expandable and contractable trim rod to adjust a trim angle of a body of an outboard engine system. The thrust receiver includes a shaft portion rotatable about an axis generally parallel to an axis of the trim rod, and a pressure-receiving portion provided on the shaft portion to abut against a tip end of the trim rod. An abutment point between the trim rod and the pressure-receiving portion is displaced by a distance from an axis of the shaft portion in a lateral direction of the system body. Because the pressure-receiving portion of the thrust receiver rotates about the axis of the shaft portion accompanying the expansion and contraction of the trim rod, a twisting generated at the abutment point can be minimized to suppress generation of an abnormal sound. Moreover, the structure can be simplified to contribute to a reduction in cost, as compared with a system in which a ball is disposed at an abutment point.