A variable capacitor comprising: a movable first electrode, wherein the first electrode comprises a lower surface, and a movement of the first electrode is done a 2-axial movement; and a second electrode formed with an insulating film, wherein the second electrode comprises a upper surface and a side surface, and the insulating film is disposed at the upper surface and the side surface of the second electrode; and a drive part configured for moving the first electrode towards the second electrode by the 2-axial movement such that the lower surface of the first electrode is closely contacted with the insulating film and that the first electrode and the second electrode has an overlapped area with a determined size, wherein in a state that the first electrode is closely contacted with the insulating film a capacitance value between the first electrode and the second electrode depends on the size of the overlapped area of the first electrode and the second electrode, wherein in an initial state that the first electrode is floated over the insulating film of the second electrode, wherein the overlapped area is determined by moving of the first electrode into a X-axial direction, wherein the lower surface of the first electrode is contacted with an upper surface of the insulating film by moving of the first electrode into a Y-axial direction, characterized in that the insulating film is applied with a plurality of insulating films with a different dielectric constant, wherein the first electrode moves and clings to at least one of the insulating films, and wherein the at least one of the insulating films is interposed between the movable first electrode and the second electrode to adjust a dielectric constant of the insulating film. a movable first electrode, wherein the first electrode comprises a lower surface, and a movement of the first electrode is done a 2-axial movement; and a second electrode formed with an insulating film, wherein the second electrode comprises a upper surface and a side surface, and the insulating film is disposed at the upper surface and the side surface of the second electrode; and a drive part configured for moving the first electrode towards the second electrode by the 2-axial movement such that the lower surface of the first electrode is closely contacted with the insulating film and that the first electrode and the second electrode has an overlapped area with a determined size, wherein in a state that the first electrode is closely contacted with the insulating film a capacitance value between the first electrode and the second electrode depends on the size of the overlapped area of the first electrode and the second electrode, wherein in an initial state that the first electrode is floated over the insulating film of the second electrode, wherein the overlapped area is determined by moving of the first electrode into a X-axial direction, wherein the lower surface of the first electrode is contacted with an upper surface of the insulating film by moving of the first electrode into a Y-axial direction, characterized in that the insulating film is applied with a plurality of insulating films with a different dielectric constant, wherein the first electrode moves and clings to at least one of the insulating films, and wherein the at least one of the insulating films is interposed between the movable first electrode and the second electrode to adjust a dielectric constant of the insulating film.