To provide a lubricating device capable of improving cooling performance, wear resistance and engine speed or response, preventing metal fatigue, saving fuel consumption, cleaning exhaust gas, increasing horsepower and torque per cylinder capacity, reducing the amount of engine oil for cooling, and decreasing engine sound, by using a crank shaft or a cam shaft composing an engine, providing an oil hole which lubricating oil is sent on the crank shaft or the cam shaft, and providing and outlet hole from which the sent oil jets out to the outside through the oil hole so as to efficiently supply the lubricating oil to rotating portion or a sliding portion of the engine.

An oil hole to which lubricating oil is sent is provided on a crank shaft or a cam shaft composing an engine. An outlet hole through which the sent oil jets from the oil hole to the outside is provided on a suitable place.