To provide an electronic imaging unit having a high-performance zoom lens having a variable power ratio of ≥ 3.5, although it is satisfactorily small-sized and has a wide viewing angle, and to provide a portable terminal device equipped with the electronic imaging apparatus.

The electronic imaging unit is provided with the zoom lens 4 constituted of a plurality of groups, for varying the power by changing a distance between the respective groups, and an imaging element 14 for converting an optical image formed through the zoom lens 4 to an electrical signal. The zoom lens 4 is provided with at least a 1st group I having a negative focal distance and a 2nd group II having a positive focal distance in order from an object side, and a diaphragm which is moved together with the 2nd group is arranged on the object side of the 2nd group, and the diaphragm is constituted of diaphragms A and B where discrete two kinds of aperture areas can be selected, and in the descending order of the aperture areas of the diaphragms A and B, that is, when (A>B) is established, the diaphragms A and B are controlled to be driven so that the diaphragm B is effective at the short focal end of the zoom lens 4, and the diaphragm A is effective at the long focal end of the zoom lens 4.