To provide an oil temperature control device of lubricating oil in which fuel economy is improved by accelerating the rising of lubricating oil temperature during warming up.

The oil temperature control device of the lubricating oil has a lubricating oil storing part 12 for storing the lubricating oil, a lubricating oil flow channel 13 for circulating the lubricating oil, a lubricating oil feeding means 14 for drawing up and pumping the lubricating oil, heat exchanging part 15 for carrying out the heat exchange between cooling water and the lubricating oil, a bypass flow channel 16 branched from the lubricating oil flow channel 13 between the lubricating oil feeding means 14 and the heat exchanging part 15, and a flowing channel switching means 17 arranged in the branch part of the lubricating oil flow channel 13 and the bypass flow channel 16, flowing the lubricating oil through the bypass flow channel 16 when the oil temperature of the lubricating oil is not more than the predetermined threshold and flowing the lubricating oil through the heat exchanging part 15 when the oil temperature of the lubricating oil is higher than the predetermined threshold, the flowing channel switching means 17 flows the lubricating oil through the heat exchanging part 15 while warming up an internal combustion engine even though the oil temperature of the lubricating oil is not more than the predetermined threshold.