To provide a connecting structure of a connecting rod which easily and quickly performs connection and disconnection of a mounting rod and a mounted rod by a connecting part having a spring.

The structure consists of a rear side engaging part 33 in which a spring 7 in a connecting part 2 for connecting and disconnecting a mounted rod 3 and a mounting rod 4 is fitted in a holder 6 on a rear side of a spring insertion groove 31 to be supported, an intermediate supporting part 35 extended from the rear side engaging part 33 to the front of a spring insertion groove 31 through an extension portion 34 and supported by the holder 6, and a locking part 32 formed so as to be insertable in the spring insertion groove 31 in a tip of a spring arm part 36 extended by being folded back to the rear side from the intermediate supporting part 35.