There is provided a keyboard device for a keyboard musical instrument, which is capable of enhancing the key touch feeling sensed when each key is depressed, and durability of stoppers. Keys each open downward, and have side walls and an abutment portion provided inside the side walls. The abutment portion has a lower end located at approximately the same height as lower ends of the side walls. The keys each perform downward pivotal motion when depressed. Stoppers are arranged under the keys in a manner associated therewith, respectively, for abutment of the side walls and the abutment portion of the associated key thereagainst, for stopping downward pivotal motion thereof. The stoppers have a shock-absorbing property.