Method for manufacturing burring processed member

A method for manufacturing a burring processed member, the method comprising:

• forming a side wall and a seating face by pressing an inner-circumferential surface of a curved portion in a first direction, the side wall protruding from a rim surrounding a first hole on the curved portion, the curved portion being a plate-like member whose cross section that is orthogonal to an axial line is curved, the seating face extending from a tip of the side wall;
• and
• forming a second hole and a burring processed portion, the second hole having a circular shape and penetrating through the seating face, the burring processed portion protruding in the first direction from the rim of the first hole and having a wall-like structure surrounding the first hole,
• wherein a direction that the cross section of the curved portion extends along is defined as a circumferential direction,
• wherein a peripheral area of an outer rim of the seating face is defined as an outermost rim,
• wherein the seating face comprises two crests that are situated at each end thereof in the circumferential direction, and
• wherein the seating face is slanted such that a seating face height becomes smaller from each of the crests to a substantial center in the circumferential direction, the seating face height being a length in the first direction between a reference plane and the seating face, the reference plane being a virtual plane that lies orthogonal to the first direction and lies closer to the inner-circumferential surface than the seating face.