Abstract: A chassis cab vehicle includes a lower frame, which constitutes a lower structure of the vehicle and is equipped with a pair of side members extending in a lengthwise direction of the vehicle. A battery is coupled between the side members. An upper body is coupled to a front portion of the lower frame and forms a cabin interior. A side sill is formed at a lower end at each side of the upper body and extends to a rear side of the cabin interior. The side sills overlap the respective side members in a lateral direction of the vehicle when coupled to the lower frame.

Abstract: A frame structure for a vehicle includes: an inner panel connected to a side member and defining an inner side of a rear part of the side member; an outer panel connected to a rear side of the side member and coupled to an outer side of the inner panel defining a closed cross-section together with the inner panel and defining an outer side of the rear part of the side member; an opening portion formed below the inner and outer panels partially opening the closed cross-section so that a front end of a rear suspension arm can be inserted into the opening portion; and a reinforcing member disposed in the opening portion defining the closed cross-section together with the outer panel and the inner panel and configured to close an internal space in the outer and inner panels.