There is described a switching device whose disconnection cause can be identified, and a method for displaying the disconnection cause of a switching device. The undergarment further includes a pair of elastically stretchable second wings placed upon the first wings and extending outward from the transversely opposite side edge portions of the rear waist region, proximal side edge portions are not contiguous to the transversely opposite side edge portions of the crotch region. Charge storage layers are formed along side faces of the through-holes and inner faces of the gaps, and silicon pillars are filled into the through-holes.