PURPOSE: To provide a gas insulated electric machine having simple structure and excellent insulation performance in which a metallic foreign matter is restricted from moving, while bounding, between a conductive part and a metallic container.

CONSTITUTION: In a gas insulated electric machine wherein elongated conductive parts 2, 3 are laid longitudinally in a cylindrical metallic container 1 arranged horizontally and insulation gas is filled in the metallic container 1 in order to insulate the conductive parts 2, 3 from the metallic container 1, a dielectric 5 is applied at least on the inner face at the bottom part of the metallic container 1 within a range where the field strength between the conductive parts 2, 3 and the metallic container 1 is the highest.