To sufficiently extract elasticity characteristics in a lateral direction given to a snowboard itself by avoiding the contact or the appropriate contact with the upper surface of the snowboard without excessive hindrance to curving of the snowboard by the rear surface of the bottom of a binding even if right and left parts of the snowboard are curved upward.

A displaced part displaced upward is formed in the periphery of a fixing mechanism disposed part to the snowboard on the rear surface of the bottom of a body of the binding, and a spacer whose upper surface is in contact with the displaced part and whose lower surface is in contact with the snowboard is detachably disposed in at least part of the space formed between the displaced part and the snowboard.