PURPOSE: To secure the leak resistance by keeping a delta torque constant even in the case where an interference value between a pin thread and a coupling thread is apart from the desired value.

CONSTITUTION: In a pipe joint connecting an external thread part 3 of a pin part of an oil well pipe and an internal thread part 4 of a coupling 2, it is featured that at least one side of the pin and the coupling is subjected to temperature adjustments such as heating or cooling, etc., thereby setting a temperature difference to both of them, through clamping is performed by means of a torque control system.