A lubrication device including a tank of fluid lubricant to be dispensed to a user position, a component for raising the pressure of the lubricant, a device for regulating the flow rate of a pressurized lubricant, and a distributor for enabling the lubricant flow to be conveyed to the user position with regulated flow rate. The regulating device including a body provided at least with one feed channel and one outflow channel put into communication by an aperture within the interior of which a valving element is movable provided with a perimetral lateral surface in which at least one window is provided in communication with a free end of the valving element.