Abstract: An outboard engine assembly has a stern bracket adapted to be fixed to a boat body, a swivel case vertically swingably supported on the stern bracket, an engine body laterally swingably supported on the swivel case, and a tilt cylinder device disposed between the stern bracket and the swivel case. The outboard engine assembly has a corrosion-resistant mechanism comprising a first anodic metal element attached to a lower portion of the engine body, a second anodic metal element attached to a submersible portion of the stern bracket, a first electric connecting circuit by which the first and second anodic metal elements are electrically connected to each other, and a second electric connecting circuit branched from the first electric connecting circuit and connecting the first electric connecting circuit to the tilt cylinder device. The tilt cylinder device comprises a cylinder unit actuatable by a pressurized fluid supplied from a pressure fluid supply.