Abstract: A pipe joint connecting a pipe using an anaerobic adhesive, which possesses a double pipe structure formed with an inner pipe fitting into the inner circumference side of the end of the pipe, and an outer pipe fitting into the outer circumference side of the end of the pipe, integrated with a gap between them, and a tapered surface formed with at least one or the other of the inner piper or outer pipe approaching the other; and a pleated O-ring provided on the end of the outer pipe to set the pipe in place by tightening an O-ring locking material supported by the outer pipe.