To provide a handbag type paper-made folding box capable of solving the problems that a cake is inconveniently housed/taken out only through the top part of the box, the structure of the box is complicated to increase the cost is increased and the box cannot be assembled in one operation.

Side end ridges adjacent to each other of rectangular wall plates continuous to four sides of a rectangular bottom plate are connected to each other via a corner piece having a folding crease in the center thereof, the corner folding crease is folded inward of a box, a lid is continuously connected to upper edges of a pair of facing wall plates, and a handle is continuously connected to an upper edge of the lid. The box is assembled by inserting both ends of the handle into insertion ports in the center of a substantially triangular stay wall continuously connected to upper edges of another pair of facing wall plates.