Blank and paper container

The quality of a blank for a paper container with a coating is stabilized. The blank 10 comprises a body part 14 having a paper base material layer 11, an inner layer 12 provided on an inner surface 11 a of the base material layer 11, and an outer layer 13 provided on an outer surface 11 b of the base material layer 11, and a covering part 15 covering an end surface 11 c of the base material layer 11 in the body part 14. The coating part 15 is a portion where an extension portion extending from an end surface of the base material layer 11 in the inner layer 12 and the outer layer 13 is welded. The inner layer 12 and the outer layer 13 include a first thermoplastic resin layer, a second thermoplastic resin layer, and a polyester layer in contact with the base material...