A low-cost haptic feedback keyboard device for providing haptic feedback to a user for enhancing interactions in a displayed environment provided by a computer. Both first and second magnetic layers have bcc crystalline structures, and said non-magnetic spacer layer has a film configuration in which an insulating layer or a semiconductor layer is inserted into a metal layer. The hinge section is configured such that the traction section is hinged for rotation relative to a generally fixed axis. Since a thin part of the outer shell is sufficiently thin on a swell, the excellent fit can be given to the user even if the outer shell is formed of a hard elastic material to fully secure the durability of the grip member. 02O2, and the coating layer is made of a material such as MxPyOz.