A touch input judgment device includes: a rotation direction judgment unit that determines a selection value change amount, to be added to a current selection value, when a rotation operation in a normal direction is inputted through a touch panel and stores rotation direction information in a storage unit when a rotation operation in the normal direction as a first rotation operation is performed; and a selection value change unit that sets a new current selection value after a change to a value obtained by adding a first selection value change amount to the current selection value when a rotation operation subsequent to the first rotation operation is a rotation operation in the normal direction and maintains the current selection value without change when the subsequent rotation operation is judged to be the return operation of the finger position.