a keyboard chassis,

a key extending a predetermined length in a front-rear direction and disposed on the keyboard chassis, and

a key support mechanism engaged with the keyboard chassis and provided so as to support the key from below, the key support mechanism causing, upon depression of the key, the depressed key to operate such that the key pivotally moves about a virtual pivot located rearward of a rear end of the key,

wherein the key support mechanism comprises:

a first arm configured to extend a predetermined length in the front-rear direction and be pivotally and removably engaged with a first pivot shaft provided on the keyboard chassis, the first arm having a front end pivotally and slidably connected to a front portion of the key; and

a second arm configured to extend a predetermined length in the front-rear direction and be pivotally and removably engaged with a second pivot shaft provided on the keyboard chassis at a location rearward of the first pivot shaft, the second arm having a rear end pivotally connected to a rear portion of the key, and including a second arm front-side connecting portion which is disposed forward of the second pivot shaft and is pivotally, slidably and removably connected to a first arm rear-side connecting portion rearward of the first pivot shaft of the first arm,

wherein the first arm and the second arm are configured such that when the first arm and the second arm are mounted on the keyboard chassis at the time of assembly of the keyboard device, in a state in which one of the first arm and the second arm is pivotally engaged with the keyboard chassis, the other of the first arm and the second arm is capable of being mounted on the keyboard chassis while being connected to the one of the first arm and the second arm.