A circuit board connection structure includes: a circuit board on which an electric circuit is formed at least on the surface thereof and on which an electric component is mounted on either the first surface or the second surface a first signal line connecting portion on the first surface of the circuit board and a second signal wire connecting portion A signal cable in which a plurality of signal lines electrically connected to the second signal line connecting portions of the two surfaces are inserted, a signal cable integrally fixing the signal cable and the circuit board, so as to cover the cable end portion of the signal cable An annular fixing portion to be fixed, a flat plate portion joined and fixed to at least one surface of the circuit board, and a connecting member having a transition portion between the flat plate portion and the fixed portion, and is fixed to the fixing portion The center axis of the cable of the signal cable is displaced to the side of the electric component mounted on the first surface or the second surface with respect to the central axis in the longitudinal direction of the circuit board fixed to the flat plate portion.基板接続構造は、少なくとも表面に電気回路が形成され、第1面若しくは第2面の何れかに電気部品を実装した回路基板と、回路基板の第1面の第1の信号線接続部及び第2面の第2の信号線接続部に電気的に接続される複数の信号線を内挿した信号ケーブルと、信号ケーブルと回路基板とを一体固定する、信号ケーブルのケーブル端部を覆い包むように固定される環状の固定部、回路基板の少なくとも一方の面に接合固定される平板部、及び平板部と固定部との間に移行部を有する連結部材と、を具備し、固定部に固定された信号ケーブルのケーブル中心軸は、平板部に固定された回路基板の長手方向中心軸に対して第1面若しくは第2面に実装された電気部品側に位置ずれしている。
