A photoelectric conversion element includes a semiconductor substrate which has a substrate outer edge including a circular arc, and a first terminal, a second terminal, a third terminal, and a fourth terminal disposed in this order along a circumferential direction of the circular arc on one surface side of the semiconductor substrate, and in which each of a distance from the substrate outer edge to the second terminal and a distance from the substrate outer edge to the fourth terminal is greater than both a distance from the substrate outer edge to the first terminal and a distance from the substrate outer edge to the third terminal.