A photoelectric conversion element includes: a substrate having an element formation surface; a first electrode provided on the element formation surface and extending along one direction of the element formation surface up to an end portion of the element formation surface; a photoelectric conversion layer provided above the first electrode and including a first region having a first thickness and a second region extending from an end portion of the first region up to an end portion of the first electrode and having a second thickness larger than the first thickness; and a second electrode provided above the first and second regions and extending up to an end portion of the photoelectric conversion layer.