To provide a snowboard binding whose flat base is capable of adjusting rigidity so as to adjust sensitivity to movement added by an athlete and the sensitivity of a snowboard.

This snowboard binding is provided with the flat base 10 provided with a means for being fixed to shoes and a circular opening part 18 formed complementarily to a plate 19 for being fixed to the snowboard on a center so as to be adjustably rotated around the plate 19. The base 10 is provided with a notch for connecting the plate 19 at an angle position set beforehand around the opening part and the base 10 is provided with two arms 21 and 22 adjacently to at least one of the side direction end parts. They are projected from the base 10 and converged in an area where the two arms 21 and 22 face each other and are connected with a component for adjusting a mutual distance between the two arms.