If separations between photoelectric conversion elements are different from each other, charge leaking into adjacent photoelectric conversion elements varies. A photoelectric conversion apparatus of the present invention includes a first semiconductor region that can be potential barriers against signal charge, between first and second photoelectric conversion elements. Further, the apparatus includes a second semiconductor region that has the same depth as the depth of the first semiconductor region and a width narrower than the width of the first semiconductor region and can be potential barriers against the signal charge, between the first and a third photoelectric conversion element. Moreover, the apparatus includes a third semiconductor region that can be potential barriers against the signal charge under the first semiconductor region and the second semiconductor region.