A dry sump type lubrication device for a motorcycle includes a four stroke engine having, in a crankcase bottom, a first oil pump for collecting lubricating oil and a second oil pump for delivering lubricating oil. A frame supporting the four-stroke engine and having left and right down tubes running around the crankcase from the crankcase front thereof toward a region therebelow is provided. An oil tank is disposed in a region surrounded by a forward end of the crankcase and the left and right down tubes, a return passage for the lubricating oil collected by the first oil pump to be returned to the oil tank. A feed passage for the lubricating oil returned to the oil tank to be introduced into the second oil pump and an overflow passage for the lubricating oil in the oil tank to be returned to the four-stroke engine are also provided.