INPUT DEVICE SET AND COMPOSITE INPUT DEVICE SET

An input device set that is placed on a touch panel and includes a collection of individually identifiable input devices, each of the input devices has a plurality of contacts that project from a base and input coordinates into the touch panel, each of the contacts includes a contact surface that touches a placing surface of the touch panel and inputs the coordinates and a coordinates identifying area that is included in the contact surface and includes a center of gravity of the contact surface, the coordinates identifying areas are disposed so as not to overlap one another among the input devices, and areas of the contact surfaces are disposed so as to overlap in at least two input devices.