<p>In a vertical engine (4) having a crankshaft (13) directed in a vertical direction and a flywheel (34) provided on a lower end (13b) of the crankshaft (13) projected through a bottom wall of a crank chamber, the crank chamber (23) is formed by a skirt section (18A) integral with a cylinder block (18) and a split crankcase (19) attached to the skirt section (18A) putting respective contacting faces together and an oil dropping hole is formed in a bearing wall section (28) provided on the cylinder block side and forming a lowest crank bearing section within the crank chamber (23). The oil dropping hole (81) communicates with an lower side of the bearing wall section and an upper side of the bearing wall section positioned within a lowest cylinder and is inclined downward from the cylinder side to the contacting face of the skirt section (18A) facing to the split crankcase (19). A flywheel room (61) is formed under the bottom wall (53) of the crank chamber (23) and an oil pan (68) is provided under the flywheel room (61). An oil return passage (83) extending from the crank chamber to the oil pan (68) detours round the flywheel room (61). <IMAGE></p>
