An input device includes a storage section, a display section, a touch sensor, a control section, and a display switch section. The control section switches the display state of a to-be-deleted symbol string on the display section to any one of a second half hiding state, a first half hiding state, and a full display state every time the display switch section is pressed during touch operation on the display section by a user. The second half hiding state is to hide a second half symbol string, out of the to-be-deleted symbol string, displayed behind a deletion reference position. The first half hiding state is to hide a first half symbol string, out of the to-be-deleted symbol string, displayed before the deletion reference position. The full display state is to display the to-be-deleted symbol string in full.