Lubrication structure of engine

A lubrication structure of an engine, comprising:

• a crankcase provided with a crank chamber that houses a crankshaft;
• a first oil reservoir in communication with the crank chamber and formed adjacent a bottom of the crank chamber;
• a second oil reservoir in communication with the first oil reservoir and formed adjacent a side of and on a bottom of the first oil reservoir;
• a third oil reservoir in communication with the second oil reservoir and formed adjacent a bottom of the second oil reservoir;
• and
• a reed valve extending diagonally from the bottom of the first oil reservoir toward the top of the second oil reservoir in a part where the first oil reservoir and the second oil reservoir communicate with the crankcase, said reed valve being provided with a valve element that opens and closes according to a variation of pressure in the crank chamber,
• wherein the valve element of the reed valve is arranged on the side of the second oil reservoir.