To prevent the release of a portable telephone, quickly take it out or in, make a call sound easily audible, and effectively utilize the space of a gusset section.

Upper sections of the front plate 2 and rear plate 3 constituting the front and rear barrel sections of a bag main body 1 are openably connected by a fastener 4. A gusset section 5 is a recessed shape inside the bag main body 1. A portable telephone storage section 7 opened upward and capable of inserting a portable telephone 6 and the extension section 8 of the belt-like fastener 4 are provided on the outside of the gusset section 5. Coupling members 9, 10 coupled with the portable telephone storage section 7 and the extension section 8 are provided, and the release of the portable telephone 6 from the storage section 7 is prevented by the extension section 8.