A high pressure bushing arranged through by penetrating a stator frame of a rotating electrical machine in which a cooling gas is sealed, the high pressure bushing characterized by comprising: a hollow connecting conductor that has a machine outer side end portion sealed, and introduces the cooling gas within the machine from a machine inner side end portion; a gas circulation pipe that is arranged in an inner circumference side of the hollow connecting conductor with a first gap, and discharges the cooling gas toward a machine inner side; and an insulating cylinder that is arranged in an outer circumference side of the hollow connecting conductor with a second gap, and electrically insulates the hollow connecting conductor and the stator frame, wherein at least a communicating hole (11a, 11b, or 11c) is provided in the hollow connecting conductor and at least a reflux hole (12a, 12b, or 12c) is provided in the gas circulation pipe, such that the cooling gas flows in both of the first gap and the second gap, passes through an inner side of the gas circulation pipe, and is discharged to the machine inner side, characterized in that the hollow connecting conductor includes a first communicating hole located in the machine inner side, and a second communicating hole located in a machine outer side, the gas circulation pipe includes a reflux hole located in the vicinity of a machine outer side end portion of the gas circulation pipe, and the cooling gas within the machine is introduced into the first gap from the machine inner side end portion of the hollow connecting conductor, and while the cooling gas passes through an inner circumference side passage of the hollow connecting conductor, a part of the cooling gas introduced into the first gap passes through the first communicating hole and is introduced into the second gap, passes in an outer circumference side passage of the hollow connecting conductor, passes through the second communicating hole, and merges with the cooling gas that has passed an inner circumference side passage of the hollow connecting conductor, and a merged cooling gas passes through the reflux hole, passes inside the gas circulation pipe, and is discharged to the machine inner side. a hollow connecting conductor that has a machine outer side end portion sealed, and introduces the cooling gas within the machine from a machine inner side end portion; a gas circulation pipe that is arranged in an inner circumference side of the hollow connecting conductor with a first gap, and discharges the cooling gas toward a machine inner side; and an insulating cylinder that is arranged in an outer circumference side of the hollow connecting conductor with a second gap, and electrically insulates the hollow connecting conductor and the stator frame, wherein at least a communicating hole (11a, 11b, or 11c) is provided in the hollow connecting conductor and at least a reflux hole (12a, 12b, or 12c) is provided in the gas circulation pipe, such that the cooling gas flows in both of the first gap and the second gap, passes through an inner side of the gas circulation pipe, and is discharged to the machine inner side, characterized in that the hollow connecting conductor includes a first communicating hole located in the machine inner side, and a second communicating hole located in a machine outer side, the gas circulation pipe includes a reflux hole located in the vicinity of a machine outer side end portion of the gas circulation pipe, and the cooling gas within the machine is introduced into the first gap from the machine inner side end portion of the hollow connecting conductor, and while the cooling gas passes through an inner circumference side passage of the hollow connecting conductor, a part of the cooling gas introduced into the first gap passes through the first communicating hole and is introduced into the second gap, passes in an outer circumference side passage of the hollow connecting conductor, passes through the second communicating hole, and merges with the cooling gas that has passed an inner circumference side passage of the hollow connecting conductor, and a merged cooling gas passes through the reflux hole, passes inside the gas circulation pipe, and is discharged to the machine inner side.