Patent ID: 8809660

Claim:
A keyboard device for an electronic musical instrument, the keyboard device comprising: plural white keys and black 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, each white key having an edge line extending in the longitudinal direction on a crossing portion of a side face and a top face, and each black key having an edge line extending in the longitudinal direction on a crossing portion of a lower side face and an upper side face tilting inward with respect to the lower side face, wherein a pitch is assigned to each of the plural white keys and black keys, each of plural white keys and each of black keys include an operation portion that is depressed and released by the performer, and a drive unit extending downward on a front end of the operation portion, and a length from the front end of the operation portion to the key support portion is different among the plural white keys and black keys; plural hammers, each of which includes an engagement portion engaged with the drive unit of each of the plural white keys and the drive unit of each of the plural black 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 white keys and black keys; and a restricting member that is arranged to extend in the direction of the arrangement of the plural white keys and black keys, and that restricts the rocking movement of the plural hammers in order to restrict the rocking range of the plural white keys and the plural black keys, wherein, when a first key out of the plural white keys and the plural black keys and a second key having the distance longer than the distance of the first key have a predetermined rocking angle respectively, the first key and the second key being both white keys or both black keys, a positional relationship between a plane including the key support portion of the first key and the front end of the operation portion of the first key, and the top face of the first key is set in order that the position of the front end of the operation portion of the first key in the vertical direction and in the longitudinal direction is the same as the position of the front end of the operation portion of the second key in the vertical direction and in the longitudinal direction, and the top face of the first key is in plane with the top face of the second key.