A device for sterilizing containers includes a first treatment space, which is filled with a sterilizing gaseous medium under predetermined thermodynamic conditions, a tank, which is filled with a liquid medium and extends along a closed path, and a multiplicity of holding devices for holding the containers. The plug connector includes ground contact members and signal contact pairs that are arranged alternately. The light intensity control unit controls light intensity of the light-emitting elements based on an overlapping degree of the adjacent two light-emitting elements at each of the overlapping portions. In another embodiment, the lower insulating plate has various shapes of recesses on the surface.