Patent ID: 8809658

Claim:
A keyboard device for an electronic musical instrument, the keyboard device comprising: plural keys that are supported by a key support portion in order that front ends thereof rock in the vertical direction by a key depression/release operation by a performer, wherein a pitch is assigned to each of the plural keys, and a length from the front end to the key support portion is different among the plural keys; plural hammers, each of which includes an engagement portion engaged with each of the plural keys, and each of which is supported by a hammer support portion in order to rock with the rocking movement of each of the plural keys, wherein positions of the hammer support portions in the vertical direction and in the longitudinal direction are the same, and the positions of the engagement portions in the vertical direction and in the longitudinal direction during the key release state are the same; and a first restricting member and a second restricting member that are arranged to extend in the direction of the arrangement of the plural keys, and that restrict the rocking movement of the plural hammers in order that the range of the rocking angle becomes the same for all of the plural hammers.