An information terminal device is provided that may use the input functionality of a touch panel to remove the restriction on the use thereof, for example, release the key lock. The information terminal device (1) is an information terminal device including a display (11) and a touch panel (12), including: a pattern storage memory (43) configured to store a release pattern that is to be entered into the touch panel (12) to remove the restriction on the use of the information terminal device, the release pattern being designated by a user as a graphic pattern; a comparison unit (44) configured to determine whether an entered pattern entered into the touch panel matches the release pattern; and a controller (34) configured to remove the restriction on the use of the information terminal device if the comparison unit (44) determines that the entered pattern matches the release pattern.