An accessories arrangement structure for an internal combustion engine for securing a banking angle, increasing a degree of the freedom of the layout, concentrating heavy accessories and an overhanging part of the internal combustion engine, enhancing the maneuverability of the vehicle and reducing the size of the engine. An accessories arrangement structure of an internal combustion engine for a motorcycle includes an oil cooler and an oil filter that are attached together with a balancer in a lower part wherein the front of a crankcase that journals a crankcase directed in a vehicular width direction, in which the oil cooler and the oil filter are attached to the front in a vehicular traveling direction of the crankcase project with a balancer, the oil cooler and the oil filter being adjacent in a front view of the vehicle and arranged abreast in parallel with a crankshaft.