Button assembled with removable screw and method of attaching removable screw

A method of attaching a removal screw, the method comprising:

• a first step of preparing a button that includes a plate portion and a post portion erecting from the plate portion of the button and has no convexo-concave surface in a cavity provided in the post portion of the button and preparing a screw that includes a plate portion and a post portion erecting from the plate portion of the screw and has screw threads on an outer surface of the post portion of the screw;
• and
• a second step of placing fabric between the button and the screw, tucking the post portion of the screw into the cavity of the button to allow the post portion of the screw to pass through the fabric, attaching the screw to the button, and forming the convexo-concave surface corresponding to a shape of the screw threads on the outer surface of the post portion of the screw in the cavity of the button,
• wherein, in the first step:
• the button includes an insert portion and an outer portion;
• the insert portion includes the plate portion of the button and the post portion of the button that are formed of a resin;
• the outer portion covers an outer side of the insert portion and is formed of a metal;
• and
• the outer portion covers an entire side face of the insert portion and a bottom face of the insert portion.