To provide lubricating oil spraying device which can accurately regulate the number of actions of a lubricating oil pump, and can easily carry out the regulating work near a worker.

A lubricating oil spraying device for a machine tool is equipped with a lubricating oil pump 5 which pulsates compressed air by a pulsation generating means 21, and reciprocates a spring reset type plunger 11 by pulsative compressed air to periodically discharge the lubricating oil; an oil-air feed supply pipe 25 composed of a double pipe consisting of an inner pipe for oil 27 and an outer pipe for air 28; and an atomizing nozzle provided at the tip of the oil-air feed supply pipe 25. The pulsation generating means 21 for the lubricating oil pump 5 is composed of a solenoid opening-closing valve 22 provided insertedly in a pump driving air supply path 20 and an electric timer for making the solenoid opening-closing valve 22 periodically carry out fixed opening-closing motion.