OPERATION INPUT APPARATUS AND OPERATION INPUT DETECTION APPARATUS

摘要

An operation input apparatus configured to receive a force from an operator, including: a board 10 including a placement surface on which coils 21˜24 are placed, the coils being arranged in a circumferential direction of a circle formed by connecting points apart from a reference point by the same distance; a key 30 that is provided in a side where the force is input with respect to the board 10; and a return spring 51˜54 elastically supporting the key 30, wherein the key 30 includes an opposed surface opposed to the placement surface and an operation surface configured to receive an application of the force, and causes an inductance of at least one of the coils 21˜24 to change with an approach of the opposed surface to the placement surface due to the application of the force on the operation surface.