A secondary molding component comprising: a first molding portion that has a base portion and a projecting portion projecting from an outer surface of the base portion and is made of resin; and a second molding portion that has a bonded portion bonded to a circumference of the projecting portion and is made of resin, wherein the outer surface of the base portion is formed as an annular surface, wherein the projecting portion has a fused portion that is fused with a part of the bonded portion at an end opposite to the base portion, and an interface between the projecting portion and the bonded portion has a portion that is formed so as to vertically stand from the base portion wherein the projecting portion is provided in a circumferential direction of the annular surface and is formed of a plurality of the protrusions that are aligned at an interval and that are formed into a rectangular shape in a sectional view in a projecting direction of the projecting portion and in a direction vertical to the interface, and configured such that, before the bonded portion is bonded, each of the projecting portion has a standing portion and a tapered portion, wherein the standing portion vertically stands from the base portion, and wherein the tapered portion has a narrower width toward a tip end formed at an end, which is opposite to the base portion, of the standing portion in a sectional view in a standing direction of the standing portion and in a direction vertical to the interface, and configured such that, after the bonded portion is bonded, the fused portion is formed in a state in which at least the tapered portion is fused with the bonded portion, and the interface formed on both sides of the projecting portions is discontinuous in the sectional view. a first molding portion that has a base portion and a projecting portion projecting from an outer surface of the base portion and is made of resin; and a second molding portion that has a bonded portion bonded to a circumference of the projecting portion and is made of resin, wherein the outer surface of the base portion is formed as an annular surface, wherein the projecting portion has a fused portion that is fused with a part of the bonded portion at an end opposite to the base portion, and an interface between the projecting portion and the bonded portion has a portion that is formed so as to vertically stand from the base portion wherein the projecting portion is provided in a circumferential direction of the annular surface and is formed of a plurality of the protrusions that are aligned at an interval and that are formed into a rectangular shape in a sectional view in a projecting direction of the projecting portion and in a direction vertical to the interface, and configured such that, before the bonded portion is bonded, each of the projecting portion has a standing portion and a tapered portion, wherein the standing portion vertically stands from the base portion, and wherein the tapered portion has a narrower width toward a tip end formed at an end, which is opposite to the base portion, of the standing portion in a sectional view in a standing direction of the standing portion and in a direction vertical to the interface, and configured such that, after the bonded portion is bonded, the fused portion is formed in a state in which at least the tapered portion is fused with the bonded portion, and the interface formed on both sides of the projecting portions is discontinuous in the sectional view.