To reduce a trouble for separating a fiber reinforcing layer and to provide firm joining strength by arranging a mold release layer for reducing adhesive strength between thermoplastic synthetic resin pipe and fiber reinforced resin layer.

A reinforced compound pipe 1 is coated with a FRP layer 3 through a mold release layer 4 on an outer periphery of a thermoplastic synthetic resin pipe 2. In the reinforced compound pipe 1, the FRP layer 3 is separated for a prescribed length for manufacturing a spigot for TS joining. The mold release layer 4 is arranged between the thermoplastic synthetic resin pipe 2 and the FRP layer 3, and is formed for easily separating and eliminating the FRP layer 3 when exposing the thermoplastic synthetic resin pipe 2 having a prescribed length for TS-joint of the FRP layer 3. It is thus possible to easily separate and eliminate the FRP layer 3 having the prescribed length necessary for TS-joining by means of pulling one end of a slit for expanding the FRP layer 3 with a slit formed annularly, or by mean of a simple jig such as a knife.