To provide a heat shrinkable pipe joint of thermoplastic elastomer in which working is easy, natural contraction is less while stored, connection of an elbow and pipes of different diameter as well as a straight pipe is easy, being shrinkable at 50-120°C, and excellent in mechanical strength, whether resistance, chemical resistance, heat resistance, and rubber elasticity after shrinkage.

The heat shrinkable pipe joint is made from thermoplastic elastomer whose 100% tensile stress is 4.5-15.0 MPa and stretch is 200-1000%. The following equations (1)-(4) are met: 1<(De)/(Dp)---(1), 1.2≤(Dp)/(Do)≤2.5---(2), 0.35≤(Le)/(Dp)≤3.0---(3), and 0.005≤(to)/(Do)≤0.2---(4). Where, length of the pipe joint is (Le), the inner diameter of the pipe joint is (De), the inner diameter after shrinkage when the pipe joint is thermally contracted in free condition is (Do), wall thickness after shrinkage is (to), and outer diameter of jointed pipe is (Dp).