A coated prestressed concrete steel stranded cable comprising: a stranded cable in which a plurality of elemental wires each composed of steel are twisted together; an anti-corrosive coating that coats an outer circumference of the stranded cable; and an outer coating that coats an outer circumference of the anti-corrosive coating; an optical fiber provided at a position inwardly of an outer circumferential surface of the outer coating and corresponding to a strand groove in the stranded cable, the stranded cable having a plurality of outer circumferential elemental wires located at an outermost circumference of the stranded cable, and twisted around inner circumferential elemental wires or a central elemental wire, each of the outer circumferential elemental wires having a diameter smaller than a diameter of the inner circumferential elemental wires or the central elemental wire, the anti-corrosive coating having a filler portion provided at a triple point surrounded by the plurality of outer circumferential elemental wires and the inner circumferential elemental wires or the central elemental wire, the optical fiber being disposed at a strand groove formed at a triple point surrounded by three elemental wires of the stranded cable, the optical fiber being entirely embedded in the anti-corrosive coating without using an adhesive agent, characterized in that, in a cross section that is perpendicular to a longitudinal direction of the optical fiber, a length of a space between the adjacent outer circumferential elemental wires is not less than a diameter of the optical fiber, the length of the space between the adjacent outer circumferential elemental wires referring to, when a space is formed by widening an interval at one position between the outer circumferential elemental wires and the other intervals therebetween are closed, a length between tangent lines to the adjacent outer circumferential elemental wires orthogonal to a common external tangent to the adjacent outer circumferential elemental wires of the outer circumferential elemental wires that form the space. a stranded cable in which a plurality of elemental wires each composed of steel are twisted together; an anti-corrosive coating that coats an outer circumference of the stranded cable; and an outer coating that coats an outer circumference of the anti-corrosive coating; an optical fiber provided at a position inwardly of an outer circumferential surface of the outer coating and corresponding to a strand groove in the stranded cable, the stranded cable having a plurality of outer circumferential elemental wires located at an outermost circumference of the stranded cable, and twisted around inner circumferential elemental wires or a central elemental wire, each of the outer circumferential elemental wires having a diameter smaller than a diameter of the inner circumferential elemental wires or the central elemental wire, the anti-corrosive coating having a filler portion provided at a triple point surrounded by the plurality of outer circumferential elemental wires and the inner circumferential elemental wires or the central elemental wire, the optical fiber being disposed at a strand groove formed at a triple point surrounded by three elemental wires of the stranded cable, the optical fiber being entirely embedded in the anti-corrosive coating without using an adhesive agent, characterized in that, in a cross section that is perpendicular to a longitudinal direction of the optical fiber, a length of a space between the adjacent outer circumferential elemental wires is not less than a diameter of the optical fiber, the length of the space between the adjacent outer circumferential elemental wires referring to, when a space is formed by widening an interval at one position between the outer circumferential elemental wires and the other intervals therebetween are closed, a length between tangent lines to the adjacent outer circumferential elemental wires orthogonal to a common external tangent to the adjacent outer circumferential elemental wires of the outer circumferential elemental wires that form the space.