Patent ID: 7262374

Claim:
A key sheet for a pointing device, comprising: a key top; a base sheet formed of a rubber-like elastic material having, on a back surface of the base sheet opposed to a board, a protrusion-like pusher opposed to a contact switch provided on the board, and having the key top on a front surface of the base sheet on the side opposite to the back surface; and a magnet provided on the base sheet, the pusher being displaced toward the board through a depressing operation of the key top to depress the contact switch provided on the board, the magnet being laterally moved through elastic deformation of the base sheet as a result of a lateral moving operation of the key top to cause a change in magnetic flux density with respect to a magnetic sensor provided on the board, wherein an accommodating portion for the magnet for accommodating portion greatly protrudes toward the board beyond the pusher is provided on the back surface of the base sheet, and wherein the accommodating portion comes into contact with the board when the key top is depressed and causes the key top depressed to tilt using the point of contact as a fulcrum to thereby press the pusher against the contact switch.