Pipe joining body, treatment tool, and joining method

A method of manufacturing a structure including a wire rod and a tubular member, the method comprising:

• forming at least one concave portion by plastically deforming a part of an outer periphery of the wire rod;
• and
• forming, in the tubular member, at least one deformed portion that enters the at least one concave portion by inserting the wire rod into the tubular member and by pressing a portion of the tubular member covering the at least one concave portion from an outer periphery of the tubular member toward the at least one concave portion to plastically deform the portion of the tubular member,
• wherein:
• a maximum displacement amount of the tubular member in forming the deformed portion is smaller than a maximum displacement amount of the wire rod in forming the concave portion,
• the forming of the concave portion includes bringing a transfer mold having a convex transfer surface into contact with the part of the outer periphery of the wire rod and pressing the wire rod with the convex transfer surface of the transfer mold, and
• the forming of the deformed portion includes bringing a transfer mold having a transfer surface of a same shape as the convex transfer surface of the transfer mold used for the wire rod, into contact with the outer periphery of the tubular member and pressing the outer periphery of the tubular member with the transfer surface of the transfer mold.