A solid state imaging device comprising: a photoelectric conversion portion having a plurality of photosensitive regions which generate respective charges according to incidence of light and a planar shape of each of which is a rectangular shape composed of two long sides and two short sides, the photosensitive regions being juxtaposed in a first direction intersecting with the long sides; a potential gradient forming portion having an electroconductive member arranged so as to face each photosensitive region, and configured to form a potential gradient becoming higher along a second direction from one of the short sides to the other of the short sides of the photosensitive regions so that a potential is inclined so as to become deeper toward the other of the short sides of the photosensitive regions; a charge output portion which acquires the charges transferred from the respective photosensitive regions and which transfers the charges in the first direction to output the charges, the charge output section being arranged beside the other of the short sides, characterized in that, the electroconductive member includes a first region extending in the second direction between two ends of the electroconductive member in the second direction and having a first electric resistivity, and a second region extending in the second direction between the two ends and having a second electric resistivity smaller than the first electric resistivity, the dispersion of the second electric resistivity is smaller than the dispersion of the first electric resistivity, and the potential gradient forming portion further includes a pair of electrodes (9a, 9b) electrically connected respectively to two end areas in the second direction of the first region and the second region and extending in the first direction. a photoelectric conversion portion having a plurality of photosensitive regions which generate respective charges according to incidence of light and a planar shape of each of which is a rectangular shape composed of two long sides and two short sides, the photosensitive regions being juxtaposed in a first direction intersecting with the long sides; a potential gradient forming portion having an electroconductive member arranged so as to face each photosensitive region, and configured to form a potential gradient becoming higher along a second direction from one of the short sides to the other of the short sides of the photosensitive regions so that a potential is inclined so as to become deeper toward the other of the short sides of the photosensitive regions; a charge output portion which acquires the charges transferred from the respective photosensitive regions and which transfers the charges in the first direction to output the charges, the charge output section being arranged beside the other of the short sides, characterized in that, the electroconductive member includes a first region extending in the second direction between two ends of the electroconductive member in the second direction and having a first electric resistivity, and a second region extending in the second direction between the two ends and having a second electric resistivity smaller than the first electric resistivity, the dispersion of the second electric resistivity is smaller than the dispersion of the first electric resistivity, and the potential gradient forming portion further includes a pair of electrodes (9a, 9b) electrically connected respectively to two end areas in the second direction of the first region and the second region and extending in the first direction.