A range image sensor RS is provided with an imaging region consisting of a plurality of units arranged in a two-dimensional pattern, on a semiconductor substrate 1 and obtains a range image, based on charge quantities output from the units. One unit is provided with a photosensitive region, a plurality of third semiconductor regions 9a, 9b opposed to each other with a photogate electrode PG in between in a direction in which first and second long sides L1, L2 are opposed to each other, first and second transfer electrodes TX1, TX2 provided between the plurality of third semiconductor regions 9a, 9b and the photogate electrode PG, a plurality of fourth semiconductor regions 11a, 11b arranged with the third semiconductor regions 9a, 9b in between in the direction in which the first and second long sides L1, L2 are opposed to each other, and a plurality of third transfer electrodes TX3 provided respectively between the plurality of fourth semiconductor regions 11a, 11b and the photogate electrode PG.