To improve horizontal and forward/backward stability by providing a first and a second binding pin connectors to the first side surface of binding and providing a third binding pin connector to a second side surface.

The first binding pin connector 32 is arranged at a part closer to the front side of the front/rear center line of inside as the first side surface of the binding with respect to a snowboard boot. The second binding pin connector 34 is arranged at a part closer to the rear side of the center line by facing to a heel part. These pin connectors 32 and 34 form recessed semi-spherical parts 36 and 38 to form a shape to coincide with the form of the cross section of a side face part 28. In addition, the third binding pin connector 24 positioned nearly in the center with respect to the front/rear of the boot and a little closer to toes is arranged on an outer side surface as the second side surface of the binding. Thereby, the horizontal and front/rear stability is improved.