Patent ID: 8072425

Claim:
A key sheet for a pointing device, comprising: a key top; a support member having a front surface constituting an operation surface to which the key top is attached, and a back surface, which is on a reverse side of the front surface, having a pusher for depressing a contact input portion on a board opposed to the back surface; a magnet fixed to the support member at a position sidewise with respect to the pusher and around the pusher as a center, wherein when the key top is moved sidewise, the magnet moves synchronously, with a change in magnetic flux density due to the sidewise movement of the magnet being detected by magnetic sensors provided on the board, and wherein the base sheet defines an accommodation recess to receive the magnet, the base sheet having a first side wall a second side wall substantially parallel to the first side wall in a first state, both side walls being in a direct contact with the magnet in the first state, the second side wall including an elastic flexible portion allowing displacement in a depressing direction through depression of the key top toward the contact input portion, the elastic flexible portion being provided between the magnet and the pusher, wherein the support member is a base sheet formed of an elastic material.