An imaging device and a portable information terminal device of the present invention include: a blade driving unit (20) made up of a base plate (21) having an opening portion (21a) serving as an optical path, an infrared light cut filter blade (23) movably supported by the base plate between a receded position displaced from the opening portion and a position facing the opening portion, and a first electromagnetic driving source (26) that drives the infrared light cut filter blade (23); a lens optical system (32, 33, 34) arranged on the optical path passing through the opening portion; an imaging element (42) that images an object through the lens optical system; and a control unit (51) that drives and controls the blade driving unit (20) and the imaging element (42). The control unit drives and controls the first electromagnetic driving source (26) so as to move the infrared light cut filter blade (23) to the receded position when using an infrared light. In this way, the infrared light cut filter blade is provided so as to be able to recede from the opening portion, so that the normal imaging can be performed, and at the same time, the biometric information (blood vessel image) for authentication can be also imaged.