A touch panel system (1) includes a touch panel (3) and a touch position detecting section (5) for detecting a touch position on the touch panel (3). The touch position detecting section (5) includes a touch start determining section (56) for (i) setting a determining region based on a touch start position candidate which is a touch position that has been detected relatively earliest and (ii) determining that touches have been started from the touch start position candidate in a case where the touches whose starting point is at the touch start position candidate have been successively detected within the determining region a predetermined number of times or more.