Operation detection device

An operation detection device, comprising:

• a detection unit that detects a physical quantity changing upon approach or contact of a detected object to or with an operation surface and outputs detection information comprising at least information of the physical quantity and allowing for calculation of coordinates of an approach or contact position of the detected object in a coordinate system set on the operation surface;
• and
• a control unit that, when the physical quantity based on the detection information satisfies exceeds a predetermined threshold that is indicative of the approach or contact of the detected object with the operation surface, calculates and sets first detected coordinates of the detected object as reference coordinates, periodically calculates coordinates of the detected object afterwards but does not perform a coordinate update as long as coordinates of the detected object calculated after the reference coordinates are included in a first region of the operation surface that is centered at the reference coordinates, and when coordinates are calculated after the reference coordinates are outside the first region, sets a second region of the operation surface that is narrower than the first region and performs the coordinate update, and when coordinates calculated after the updated coordinates are included in the second region, does not perform the coordinate update.