PROBLEM TO BE SOLVED: To provide a connection structure and a connection method capable of surely connecting, when using a wire reduced in diameter, a wire having a diameter thicker than that of the wire, and achieving a high performance.SOLUTION: A connection structure for connecting a first wire to a second wire having a diameter smaller than that of the first wire via a connection member is such that: the tip of the first wire is inserted from an opening on one end side of the connection member, and joined by caulking； and the base end part of the second wire is inserted from an opening as an opening on the other end side of the connection member, having a diameter smaller than that of the opening on one end side, and joined by caulking.SELECTED DRAWING: Figure 1【課題】細径化した線材を用いる場合であってもその線材より太径の線材と確実に接合することができるとともに、高い性能を実現することができる接続構造および接続方法を提供する。【解決手段】第１の線材と、該第１の線材より小径の第２の線材とを連結部材を介して接続する接続構造であって、前記連結部材の一端側の開口部から前記第１の線材の先端部が挿入されてカシメ接合されてなり、前記連結部材の他端側の開口部であって前記一端側の開口部より小径の開口部から前記第２の線材の基端部が挿入されてカシメ接合されてなる。【選択図】図１
