A gas detector for remote gas detection in a target region comprises a light source for emitting a light beam into the target region and a light sensor for sensing light returning therefrom. The subframe includes a front cross member at the front part of a vehicle body; a rear cross member on the rear side of the front cross member; and a pair of right and left subframe bodies connecting these cross members to each other. A terminal cover 20 is detachably attached to the connector housing 12 so as to cover the terminals 3 and a tip end of an insulating wall 22 provided on the terminal cover 20 is fitted into a groove 15 formed in the rear wall surface 12a, whereby distances among adjacent terminals 3 can be widened and the insulation performance among the terminals 3 can be enhanced. In a second aspect of the invention, a pair of foundations held on a central rod disposed along an axis secure a number of connecting rods which, in turn, support portions of a cylinder oriented parallel to the axis.