A stereo camera comprising: a first vehicle-mounted camera comprising a first lens unit and a first imaging element configured to perform imaging via the first lens unit; wherein the first lens unit comprises a first optical information recording unit in which the sensitivity value of the first lens unit is recorded, and a second vehicle-mounted camera comprising a second lens unit and a second imaging element configured to image via the second lens unit, wherein the second lens unit comprises a second optical information recording unit in which the sensitivity value of the second lens unit is recorded, and wherein the first imaging element has a first sensitivity value recording unit in which a sensitivity value of the first imaging element is recorded, wherein the second imaging element has a second sensitivity value recording unit in which the sensitivity value of the second imaging element is recorded, and wherein the stereo camera is configured to be assembled with the first imaging element and the second imaging element selected such that a sensitivity variation width between the combined sensitivity values of the first imaging element recorded in the first sensitivity value recording unit and a sensitivity value of the first lens unit recorded in the first optical information recording unit, as a first term and the sensitivity values of the second imaging element recorded in the second sensitivity value recording unit and a sensitivity value of the second lens unit recorded in the second optical information recording unit, as a second term are identical in the first and second vehicle mounted cameras and a desired sensitivity value so that variations in the sensitivity values obtained by combining the sensitivity values can be absorbed. a first vehicle-mounted camera comprising a first lens unit and a first imaging element configured to perform imaging via the first lens unit; wherein the first lens unit comprises a first optical information recording unit in which the sensitivity value of the first lens unit is recorded, and a second vehicle-mounted camera comprising a second lens unit and a second imaging element configured to image via the second lens unit, wherein the second lens unit comprises a second optical information recording unit in which the sensitivity value of the second lens unit is recorded, and wherein the first imaging element has a first sensitivity value recording unit in which a sensitivity value of the first imaging element is recorded, wherein the second imaging element has a second sensitivity value recording unit in which the sensitivity value of the second imaging element is recorded, and wherein the stereo camera is configured to be assembled with the first imaging element and the second imaging element selected such that a sensitivity variation width between the combined sensitivity values of the first imaging element recorded in the first sensitivity value recording unit and a sensitivity value of the first lens unit recorded in the first optical information recording unit, as a first term and the sensitivity values of the second imaging element recorded in the second sensitivity value recording unit and a sensitivity value of the second lens unit recorded in the second optical information recording unit, as a second term are identical in the first and second vehicle mounted cameras and a desired sensitivity value so that variations in the sensitivity values obtained by combining the sensitivity values can be absorbed.