Portable information terminal device

abAn objective of the present invention is to provide a portable information terminal device capable of reducing excessive time and labor required in an authentication process. A sub-camera is started on the basis of operation to select "secret mode" by a user (FIG.) and brought into a photographable state after completion of an initialization process, which is followed by automatically performing an authentication process (FIG.). Therefore, it is possible to prevent troublesome photographing operation by waiting for a time course from the start of the sub-camera to reaching a photographable state, allowing reduction of excessive time and labor required in an authentication process. Moreover, a time lag generated in a period from user confirmation of a photographable state after starting the sub-camera to performing photographing operation can be reduced, where the authentication process can be carried out in a shorter period of time after starting the sub-camera, so that an amount of time required in the authentication process can be shortened.