To provide a synthetic resin pipe joint device capable of connecting easily by merely fitting a semi-hard or hard synthetic resin pipe externally by manual operation and inserting a clip in by manual operation.
This straight pipe-shaped, L-shaped or branched-shaped joint device connects a synthetic resin pipe 70 on one side with a synthetic resin pipe 70 on the other side to let water pass. Two or a plurality of cylindrical pipes 50 having a water passing hole 51 are mutually connected through a collar-like ring 40 provided on an outer peripheral face of an intermediate part or a water passing box 80 or 90, a non-return body 10 for preventing reverse return and coming-off of the synthetic resin pipe 70 when fitting it externally is provided on an outer peripheral face of a tip of each cylindrical pipe 50, and one or a plurality of circumferential channels 20 are provided on an outer peripheral face following it to fit an O-ring 30. This joint device is provided with grip bands 60 crimped on outer peripheral faces of each synthetic resin pipe 70 fitted into the non-return body 10 and the O-ring 30 externally, respectively.