For the purpose of fixing a binding unit (1) to a snowboard (4), this binding unit (1) is provided with a retaining disc (12), which is substantially circular as seen in plan view, for a base plate (11) of relatively large surface area. Mounted on this base plate (11), either directly or indirectly, are
coupling parts to provide a connection to a snowboard shoe. Teeth (49, 51) are provided between the base plate (11) and the retaining disc (12) inserted therein through a central orifice (15). The teeth (49, 51) securely fix selectively adjustable and fixable angular positions between the retaining disc (12) and the base plate (11). At least one slide element (24, 25) is provided on the retaining disc (12) and is displaceable between an extracted position (26), in which it spans or overlaps a transition region (28) between the retaining disc (12) and the base plate (11), and an inserted position, in which the slide element (24, 25) does not span or overlap this transition region (28). The slide element prevents the base plate from being lifted off the retaining disc in the extracted position while enabling it to be lifted off in the inserted position.