To provide a method of manufacturing a plurality of components by cutting an assembling member made by frictional agitation joining elements.

First material 100, second material 200, and third material 300 structuring a metallic component are prepared. The first material 100 has a cylindrical portion 110 and an edge portion 120, and a through hole 130 is formed on the cylindrical portion 110. The second material 200 has the same structure. The third material 300 has a platy shape, and is joined along joining line S1, S2 by carrying out frictional agitation joining F1 by frictional agitation joining tool 400. A surface side of the joined members is cut to be a specified shape, and then cut off by a specified width dimensions. Nest, hole machining or burr removing is conducted to obtain a required metallic component.