To provide an auxiliary wheel for snow road running which can run on a snow road smoothly without damaging the paved surface of a road and the generation of pollution of dust.

At snow road running of an automobile, an auxiliary wheel 2 mounted on a tyre for running in parallel has a diameter nearly same as the tyre for running or slightly smaller than it and is partitioned plurally and radially and each partition is made to fluid pressure chamber 4 in which a slide body 6 having a snow press body 5 on its tip is internally equipped and the space between the lower end of this fluid pressure room 4 and shaft hole 10 is made to plural fluid pressure pump room 9 and the motor room 13 with the same number adjacent to this fluid pressure pump room 9 and the motor 14 in this motor room 13 is connected with the fluid pressure pump 11 in the fluid pressure pump room 9 adjacent to this mechanically and also the fluid pressure pump 11 is communicated with plural fluid pressure rooms 4 and the snow press piece 5 is elevated by the fluid pressure.