Button fixing member and button structure

A button structure which consists of a button having a fixing opening and a button fixing member made of a synthetic resin, which is used to fix the button to a cloth, the button fixing member comprising:

• a plate-like base and
• a post protruding from the base to a front surface side of the base, the post capable of being deformed after it passes through the cloth and then the fixing opening of the button when the button is fixed to the cloth,
• wherein the post includes a cavity extending from an opening on a rear surface of the base to a closed end on a tip-side of the post concentrically with the post, and a solid portion between the closed end of the cavity and a tip of the post,
• wherein a diameter of the cavity is gradually reduced from the opening to the closed end,
• wherein the post includes a post proximal part rising from the base, an outer diameter of the post proximal part being constant, and a post distal part, an outer diameter of which is gradually reduced from an upper end of the post proximal part to the tip, the post proximal part including the cavity.