a nylon resin multi - layer pipe excellent in adhesivity to a nylon resin joint including at least a layer containing a copolymerized nylon and a layer containing a nylon resin other than the copolymerized nylon of the layer wherein the surface in contact with the joint is the layer containing a copolymerized nylon and an adhesion method for adhering a nylon resin joint to the aforementioned nylon resin multi - layer pipe using a solvent adhesive are described .