An adjusting mechanism for a jaw of a ski binding. The adjusting mechanism includes a holding plate which is fixedly secured to the upper surface of a ski. A base plate for the ski binding component is slidably disposed on the holding plate with locking means being provided to lock the base plate to the holding plate. That is, structure is provided for preventing the base plate from lifting off from the holding plate and locking structure is provided to prevent relative longitudinal movement therebetween.