A distance measurement device having better measurement accuracy than conventional distance measurement devices. A stereo camera (1) has a camera stay (4) to be secured to a housing (12) of a vehicle and also has a pair of cameras (2, 3) mounted on the camera stay (4). The camera stay (4) has an installation section (4a) located between the pair of cameras (2, 3) and to be mounted on the housing of the vehicle via fixation sections (6, 7, 8). The installation section (4a) is movable in the direction of a base line interconnecting the cameras (2, 3).