PURPOSE: To embody a slip preventive device on compacted snow or frozen road by jetting sand onto a road surface by pressurized gas after an operation part composed of a wire, a lever, a cutter, a pressurized gas cylinder or the like and a vessel part housing the sand are brought into close contact with each other by a cap.

CONSTITUTION: A cutter 3 is pushed in through lever 2 by a wire a connected to a brake pedal, and a port cover of a pressurized gas cylinder 4 is broken. Thereby, vaporized gas enters a gas introducing pipe 5 through a cavity of the cutter 3. This vaporized gas is jetted to the inside of a vessel body 8 from the tip of the gas introducing pipe 5, and pushes up sand 9 from a lower part of a siphon pipe 6, and jets it from a jetting port arranged in front of vehicle front wheels through jetting hoses 7. Thereby, since the sand falls just under the front wheels, a braking distance by a brake can be shortened.