A stretchable conductor composition comprising at least conductive particles (a) composed of a material having a specific resistance of 1 × 10 -1 SZcm or less, the conductive particles (a) having an average particle diameter, as measured by a dynamic light scattering method, of 100 μm or less, barium sulfate particles (b) having an average particle diameter, as measured by a dynamic light scattering method, of 0.01 to 18 μm, and a flexible resin (c) having a tensile elastic modulus of 1 MPa or more and 1000 MPa or less, the flexible resin (c) not including a silicone rubber, wherein the tensile elastic modulus is measured by a method in which a resin material is heated, compressed and molded into a sheet having a thickness of 200±20 μm, and then punched out into a dumbbell shape defined by ISO 527-2-1A to obtain a test piece, and a tensile test is performed by the method defined in ISO 527-1, wherein the conductive particles (a) include at least one selected from the group consisting of metal particles such as silver, gold, platinum, palladium, copper, nickel, aluminum, zinc, lead, and tin, alloy particles such as brass, bronze, cupronickel, and solder, hybrid particles such as silver-coated copper, metal-plated polymer particles, metal-plated glass particles, and metal-coated ceramic particles, wherein the barium sulfate particles (b) are contained in an amount of 2 to 30% by mass relative to the total amount of the conductive particles (a) and the barium sulfate particles (b), and the flexible resin (c) is contained in an amount of 7 to 35% by mass relative to the total amount of the conductive particles (a), the barium sulfate particles (b) and the flexible resin (c). conductive particles (a) composed of a material having a specific resistance of 1 × 10 -1 SZcm or less, the conductive particles (a) having an average particle diameter, as measured by a dynamic light scattering method, of 100 μm or less, barium sulfate particles (b) having an average particle diameter, as measured by a dynamic light scattering method, of 0.01 to 18 μm, and a flexible resin (c) having a tensile elastic modulus of 1 MPa or more and 1000 MPa or less, the flexible resin (c) not including a silicone rubber, wherein the tensile elastic modulus is measured by a method in which a resin material is heated, compressed and molded into a sheet having a thickness of 200±20 μm, and then punched out into a dumbbell shape defined by ISO 527-2-1A to obtain a test piece, and a tensile test is performed by the method defined in ISO 527-1, wherein the conductive particles (a) include at least one selected from the group consisting of metal particles such as silver, gold, platinum, palladium, copper, nickel, aluminum, zinc, lead, and tin, alloy particles such as brass, bronze, cupronickel, and solder, hybrid particles such as silver-coated copper, metal-plated polymer particles, metal-plated glass particles, and metal-coated ceramic particles, wherein the barium sulfate particles (b) are contained in an amount of 2 to 30% by mass relative to the total amount of the conductive particles (a) and the barium sulfate particles (b), and the flexible resin (c) is contained in an amount of 7 to 35% by mass relative to the total amount of the conductive particles (a), the barium sulfate particles (b) and the flexible resin (c).