A photoelectric conversion element includes: a plurality of pixels that are formed on a common semiconductor substrate and each of which includes an avalanche photodiode; a first line that is formed on the semiconductor substrate, is electrically connected to two or more first pixels included in the plurality of pixels, and collectively extracts output currents from the two or more first pixels; and a second line that is formed on the semiconductor substrate, is electrically connected to two or more second pixels included in the plurality of pixels, and collectively extracts output currents from the two or more second pixels. A light receiving area of each first pixel is larger than a light receiving area of each second pixel.