To easily and favorably glide over a desired curved track.

A board like plate 20 is pivotally attached to a front side axis 11, which intersects the longitudinal direction of a ski board 10 and is parallel to the surface of the board 10, so that the front part 21 of the plate 20 can be turned about the axis 11, whereby a ski boot can be mounted to the board 10 through the plate 20, on which the ski boot is mounted. A rear part 25 of the plate 20 is pivotally mounted to a rear side axis 12, which intersects the longitudinal direction of the board 10 and is parallel to the surface of ski board 10 so as to be turnable about the axis 12. Further, the rear side portion 18 of the board 10 is mounted so as to be slidable within a predetermined range in the longitudinal direction of ski with respect to the rear part 25.