In order to provide an information input device that solves the misclick caused by a clickable touch sensor without using information corresponding to pressure of the user's finger, the information input device includes: a touch information detecting unit that detects a touch information item obtained when a finger of the user is in contact with the touch sensor; a touch information sequence storage unit configured to store the touch information item for a predetermined period; and a pressing start position estimating unit configured to estimate a pressing start position at which the user started to press the touch sensor with the finger, based on touch information items stored in the touch information sequence storage unit, when the switch was pressed down, the touch information items including the touch information item.