PURPOSE: To provide a fanny-shape paper cap composed of a sheet of thick paper having a specified constitution and useful for advertisement in an event, etc., by printing a sponsor's name thereon.

CONSTITUTION: Belt-shaped parts 1 and 1' are formed on both the sides of a sheet of thick paper and a conical part 2 is formed in the middle part thereof. A brim part 3 is attached to one 1 of the belt-shaped parts 1, 1' and the straight line in the brim part 3 is folded in a concave shape. The brim part 3 is folded back in a conical shape along a curved crease and the belt-shaped parts 1, 1' are inserted from the above respectively into right and left cut parts 4. The shape is arranged while pressing a cross-shaped cut part 5 and the brim part 3 with the hands, thus producing the objective cap.