Keyboard device for keyboard instrument

A keyboard device for a keyboard instrument, comprising:

• a keyboard chassis;
• a plurality of keys each extending in a front-rear direction and arranged side by side in a left-right direction on the keyboard chassis, the plurality of keys being formed by white keys and black keys;
• a plurality of hammers extending in the front-rear direction and provided in association with the plurality of keys, respectively, the hammers being pivotally supported, below the keys, on the keyboard chassis, each via a hammer support shaft, and arranged side by side in the left-right direction, for each being vertically pivotally moved in a manner interlocked with depression of an associated one of the keys;
• a stopper rail formed into a plate shape extending in the left-right direction and disposed below the keyboard chassis;
• and
• a cushion extending in the left-right direction and having a uniform shape in transverse cross-section over the entire longitudinal length of the cushion, the cushion being mounted in a state placed on the stopper rail and being disposed such that predetermined portions of the plurality of hammers are placed on or opposed to the cushion in a key-released state, the cushion being contacted by the predetermined portions of the hammers from above when the hammers having been pivotally moved upward in accordance with depression of the key return to their original positions after release of the key depressed,
• wherein the stopper rail has first key type-associated portions, which are portions below the cushion, for being contacted by associated ones of the hammers associated with a first key type as one of key types of the white keys and the black keys, the first key type-associated portions being formed such that the first key type-associated portions are cut out or lower by a predetermined height with respect to second key type-associated portions, which are portions below the cushion, for being contacted by associated ones of the hammers associated with a second key type as the other of the key types of the white keys and the black keys.