Spacer for double-glazing units, and double-glazing unit

A spacer for a double-glazing unit, and a double-glazing unit, which make it possible to improve the durability performance of the double-glazing unit and moreover are capable of housing a granular desiccant in the spacer. The double-glazing unit 10 is comprised of a pair of glass plates 11 and 12 each of thickness 3.0 mm that face one another with a predetermined gap therebetween, a spacer 13 that is inserted between the glass plates 11 and 12 at a peripheral portion thereof so as to fix the predetermined gap between the glass plates 11 and 12 at, for example, 14.5 mm, and a secondary sealant 16 that is filled between the glass plates 11 and 12 on the outside of the spacer 13 and seals the spacer 13 from the exterior. The spacer 13 is comprised of an elongated thin-walled hollow body 13 b that is interposed via a primary sealant 15 between the pair of glass plates 11 and 12 in the double-glazing unit 10 and houses a desiccant 13 a. The hollow body 13 b has, at a side thereof facing onto the hollow layer 14 formed inside the double-glazing unit 10 , an overlapping portion 13 d where overlap occurs in a direction perpendicular to mutually facing surfaces of the pair of glass plates 11 and 12.