An electric double layer device comprising: an electrode unit comprising a first current collector and a second current collector wound and separated from each other by a separator; a case comprising an upper opening through which the electrode unit is received, and a lower closure; a lower collecting plate connected to the first current collector, the lower collecting plate having a lower terminal extending toward the upper opening along an outer circumference of the electrode unit, wherein the lower terminal includes a bottom surface facing the electrode unit; a lower insulating plate placed on the lower closure of the case to receive the lower collecting plate; an upper collecting plate connected to the second current collector, the upper collecting plate having an upper terminal extending toward the upper opening; an upper insulating plate placed over the upper collecting plate, wherein the upper insulating plate includes a first surface facing the electrode unit and a second surface facing the upper opening, wherein the first surface of the upper insulating plate is in direct physical contact with the upper collecting plate, and wherein the second surface of the upper insulating plate is in direct physical contact with the bottom surface of the lower terminal of the lower collecting plate; and an upper nonconductive plate fitted in the case to cover the upper opening, the upper nonconductive plate having a first connection terminal and a second connection terminal respectively connected to the lower terminal and the upper terminal, wherein the lower terminal extends toward the upper opening along the outer circumference of the electrode unit, is bent so as to be placed above the upper insulating plate, and is then bent toward the upper opening so as to be connected to the first connection terminal, wherein the upper insulating plate has therein a through hole through which the upper terminal extends, and wherein the upper terminal extends toward the upper opening from the upper collecting plate, extends through the through hole, and is then bent so as to be connected to the second connection terminal. an electrode unit comprising a first current collector and a second current collector wound and separated from each other by a separator; a case comprising an upper opening through which the electrode unit is received, and a lower closure; a lower collecting plate connected to the first current collector, the lower collecting plate having a lower terminal extending toward the upper opening along an outer circumference of the electrode unit, wherein the lower terminal includes a bottom surface facing the electrode unit; a lower insulating plate placed on the lower closure of the case to receive the lower collecting plate; an upper collecting plate connected to the second current collector, the upper collecting plate having an upper terminal extending toward the upper opening; an upper insulating plate placed over the upper collecting plate, wherein the upper insulating plate includes a first surface facing the electrode unit and a second surface facing the upper opening, wherein the first surface of the upper insulating plate is in direct physical contact with the upper collecting plate, and wherein the second surface of the upper insulating plate is in direct physical contact with the bottom surface of the lower terminal of the lower collecting plate; and an upper nonconductive plate fitted in the case to cover the upper opening, the upper nonconductive plate having a first connection terminal and a second connection terminal respectively connected to the lower terminal and the upper terminal, wherein the lower terminal extends toward the upper opening along the outer circumference of the electrode unit, is bent so as to be placed above the upper insulating plate, and is then bent toward the upper opening so as to be connected to the first connection terminal, wherein the upper insulating plate has therein a through hole through which the upper terminal extends, and wherein the upper terminal extends toward the upper opening from the upper collecting plate, extends through the through hole, and is then bent so as to be connected to the second connection terminal.