In a pipe joint, a tapered male screw thread is provided at one end and a joint connection section which is connected to a joint section is provided at the other end. The tapered male screw thread has a length adapted so that, when the tapered male screw thread has been fastened to a tapered female screw thread formed in an end cap, the entire length is engaged with the tapered female screw thread, and the sealing effect is obtained by a seal member.