The present invention relates to an insulating spacer capable of effectively attenuating an electric field and obtaining sufficient insulation performance even in a small size, and a gas-insulated electrical apparatus including the same. The insulating spacer according to the present invention is an insulating spacer interposed between the conductive conductor and the metal tank so that the conductive conductor is spaced apart from a metal tank surrounding the outside. Wherein the insulating spacer comprises: a center conductor electrically connected to the conducting conductor; An outer shield member configured to be electrically connected to the metal tank; And an insulating member which is made of an insulating material and surrounds the outer shield member so that the outer shield member is not exposed to the space between the conductive conductor and the metal tank and fixes the center conductor to the metal tank; . The outer shield member has a convex curved surface portion toward the central axis of the insulating spacer. According to the insulation spacer of the present invention, the insulation performance can be improved by alleviating the electric field at the junction, thereby miniaturizing the size of the gas insulation electrical device. Thus, the production cost of the gas-insulated electrical apparatus can be reduced.
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