A fluid loading joint, comprising: a first half provided at an end of a first vacuum double pipe, the first half including a first inner pipe, a first outer pipe, and a first blocking member, the first outer pipe forming a vacuum space between the first inner pipe and the first outer pipe, the first blocking member blocking between the first inner pipe and the first outer pipe, the first half being provided with a first inner flange at a distal end of the first inner pipe; a second half provided at an end of a second vacuum double pipe, the second half including a second inner pipe, a second outer pipe, and a second blocking member, the second outer pipe forming a vacuum space between the second inner pipe and the second outer pipe, the second blocking member blocking between the second inner pipe and the second outer pipe and forming a gas space between the first blocking member and the second blocking member, the gas space being filled with gas, the second half being provided with a second inner flange at a distal end of the second inner pipe; an annular inner insulator interposed between the first inner flange and the second inner flange; and an annular outer insulator interposed between the first outer pipe and the second outer pipe, the outer insulator surrounding the inner insulator, with the gas space positioned between the outer insulator and the inner insulator, characterized in that the fluid loading joint is a swivel joint, the first half includes a cylindrical holder holding the first outer pipe such that the first outer pipe is rotatable, that an outer flange is fastened to the holder at a distal end of the second outer pipe, and that the outer insulator is interposed between the holder and the outer flange. a first half provided at an end of a first vacuum double pipe, the first half including a first inner pipe, a first outer pipe, and a first blocking member, the first outer pipe forming a vacuum space between the first inner pipe and the first outer pipe, the first blocking member blocking between the first inner pipe and the first outer pipe, the first half being provided with a first inner flange at a distal end of the first inner pipe; a second half provided at an end of a second vacuum double pipe, the second half including a second inner pipe, a second outer pipe, and a second blocking member, the second outer pipe forming a vacuum space between the second inner pipe and the second outer pipe, the second blocking member blocking between the second inner pipe and the second outer pipe and forming a gas space between the first blocking member and the second blocking member, the gas space being filled with gas, the second half being provided with a second inner flange at a distal end of the second inner pipe; an annular inner insulator interposed between the first inner flange and the second inner flange; and an annular outer insulator interposed between the first outer pipe and the second outer pipe, the outer insulator surrounding the inner insulator, with the gas space positioned between the outer insulator and the inner insulator, characterized in that the fluid loading joint is a swivel joint, the first half includes a cylindrical holder holding the first outer pipe such that the first outer pipe is rotatable, that an outer flange is fastened to the holder at a distal end of the second outer pipe, and that the outer insulator is interposed between the holder and the outer flange.