To feed a carton for preserving powder and granular material which has moistureproofness, easy unsealability, and the resealing function, and is formed of a single blank while an unsealing perforation is not seen on the surface side at a low cost.

A rectangular parallelepiped carton with the resealing function is assembled out of one blank of a cardboard with a moistureproof resin layer being layered thereon, and has a top plate, an inner lid, a back outer plate and a back inner plate. A top plate opening part defined by top plate perforations is formed in a center of the top plate, and an inner lid opening part is formed in a center of the inner lid. The back outer plate has an unsealing flap defined by a V-shaped unsealing flap perforation continuous to the top plate perforation, an unsealing tab, and a resealing hook. The back inner plate has a cutout fitted to the resealing hook after the unsealing. A back side of the top plate and a surface side of the inner lid, and a back side of the back outer plate and a surface side of the back inner plate are partially stuck to each other, respectively.