Power unit

A power unit comprising:

• a crankcase which accommodates a crankshaft and a main shaft arranged in parallel to each other;
• a crank side cover which covers one end portion of the crankshaft from the outside in an axial direction of the crankshaft;
• a primary driven gear which is provided in the main shaft and meshes with a primary drive gear of the crankshaft;
• a clutch provided at one end portion of the main shaft;
• and
• a clutch cover which covers the clutch from the outside in an axial direction of the main shaft and is fastened and fixed to a packing surface provided on the crankcase to surround the clutch,
• wherein the primary driven gear and the packing surface overlap in a region that a virtual straight line obtained by connecting at least a center of the crankshaft to a center of the main shaft crosses when viewed from the axial direction of the main shaft.