Method for producing structure

A joining method of a structure, the joining method comprising:

• preparing a first member including a first portion provided with a first hole and a second portion provided with a second hole facing the first hole, a second member that is hollow, a die having a shape corresponding to a shape of the second portion of the first member such that the die is fitted to the second portion of the first member, and an elastic member;
• disposing the first member in the die;
• inserting the second member into the first hole of the first member;
• inserting the elastic member into the second member;
• and
• in a state where one end of the second member in an axial direction is located between the first portion and the second portion of the first member, compressing the elastic member in the axial direction to expand the elastic member in a direction orthogonal to the axial direction, thereby expanding and deforming the second member at a portion passing through the first hole of the first member to be swaged and joined to the first portion,
• wherein the die includes a support surface for applying a force from the die to the elastic member through the second hole, and
• the support surface is perpendicular to an axial direction of the elastic member.