INTERNAL COMBUSTION ENGINE AND STRADDLED VEHICLE

An internal combustion engine includes: a crankshaft; a crankcase that supports the crankshaft; an oil tank that is at least partially partitioned by the crankcase; a scavenge pump including a first intake port and a first discharge port; a feed pump including a pump shaft, a second intake port and a second discharge port, oil that has been sucked in through the second intake port as the pump shaft rotates being discharged through the second discharge port; a scavenge discharge passageway connecting the first discharge port of the scavenge pump to the oil tank; and a feed intake passageway connecting the oil tank to the second intake port of the feed pump. As viewed from the axial direction of the pump shaft, at least a portion of the feed pump and the oil tank overlap each other.