A rubber formed article comprising a laminate in which a rubber layer of nitrile rubber is laminated on a fiber base material, wherein the linear density of the fiber base material is 50 to 500 deniers, wherein the nitrile rubber contains a copolymer having 52 to 78% by weight of conjugated diene monomer units, 20 to 40% by weight of α,β-ethylenically unsaturated nitrile monomer units, and 2 to 10% by weight of ethylenically unsaturated monocarboxylic acid monomer units, wherein stress at 50% elongation of a dumbbell-shaped test piece of the laminate is 20 N or smaller, the dumbbell-shaped test piece being prepared by using Die-C in accordance with ASTM D-412, wherein the rubber area ratio of the backing that is the ratio of an area where rubber is visible when the laminate is viewed from a back side of the laminate to an area of the laminate is 15% or less, the rubber area ratio of the backing being obtained by a photograph of the side of the fiber base material as the backing being taken, a portion where the rubber constituting the rubber layer being visible and a portion where fibers being visible being respectively copied on different grid paper sheets, the portions copied on the grid paper sheets being respectively cut out, and the area ratio being calculated from the weight ratio of the cut grid paper sheets, wherein a thickness of the rubber layer is 0.30 mm or less, and wherein the rubber formed article is obtained by immersing a dip forming mold covered with the fiber base material in a coagulating agent solution to let a coagulating agent attach to a surface of the fiber base material covering the dip forming mold, followed by immersing the dip forming mold to which the coagulating agent has been attached in a latex composition for dip forming containing the copolymer and then pulling the dip forming mold up to form a rubber layer of nitrile rubber as a dip-formed layer on the surface of the fiber base material, whereafter the layer of nitrile rubber as the dip-formed layer formed on the dip forming mold is heated to crosslink the copolymer constituting the dip-formed layer, wherein the coagulating agent solution is a solution in which a coagulating agent is dissolved in water, alcohol or a mixture thereof. wherein the linear density of the fiber base material is 50 to 500 deniers, wherein the nitrile rubber contains a copolymer having 52 to 78% by weight of conjugated diene monomer units, 20 to 40% by weight of α,β-ethylenically unsaturated nitrile monomer units, and 2 to 10% by weight of ethylenically unsaturated monocarboxylic acid monomer units, wherein stress at 50% elongation of a dumbbell-shaped test piece of the laminate is 20 N or smaller, the dumbbell-shaped test piece being prepared by using Die-C in accordance with ASTM D-412, wherein the rubber area ratio of the backing that is the ratio of an area where rubber is visible when the laminate is viewed from a back side of the laminate to an area of the laminate is 15% or less, the rubber area ratio of the backing being obtained by a photograph of the side of the fiber base material as the backing being taken, a portion where the rubber constituting the rubber layer being visible and a portion where fibers being visible being respectively copied on different grid paper sheets, the portions copied on the grid paper sheets being respectively cut out, and the area ratio being calculated from the weight ratio of the cut grid paper sheets, wherein a thickness of the rubber layer is 0.30 mm or less, and wherein the rubber formed article is obtained by immersing a dip forming mold covered with the fiber base material in a coagulating agent solution to let a coagulating agent attach to a surface of the fiber base material covering the dip forming mold, followed by immersing the dip forming mold to which the coagulating agent has been attached in a latex composition for dip forming containing the copolymer and then pulling the dip forming mold up to form a rubber layer of nitrile rubber as a dip-formed layer on the surface of the fiber base material, whereafter the layer of nitrile rubber as the dip-formed layer formed on the dip forming mold is heated to crosslink the copolymer constituting the dip-formed layer, wherein the coagulating agent solution is a solution in which a coagulating agent is dissolved in water, alcohol or a mixture thereof.