A coated PC 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 having an outer circumferential portion that coats an outer circumference of the stranded cable; an optical fiber provided at a position inwardly of an outer circumferential surface of the anti-corrosive coating and corresponding to a first strand groove in the stranded cable so as to follow expansion and contraction of the stranded cable, the optical fiber being a sensor for measuring strain of the plurality of elemental wires; and an outer coating that coats an outer circumference of the anti-corrosive coating, the stranded cable having an outer circumferential elemental wire located at an outermost circumference of the stranded cable, and an inner circumferential elemental wire or central elemental wire adjacent to the outer circumferential elemental wire, the anti-corrosive coating having a filler portion provided at a triple point surrounded by the outer circumferential elemental wire and the inner circumferential elemental wire or the central elemental wire, the outer circumferential elemental wire includes adjacent outermost circumferential elemental wires, characterized in that the optical fiber is disposed at the first strand groove formed between the adjacent outermost circumferential elemental wires, the outer circumferential portion has a surface along an outer circumferential outline of the stranded cable, and in the surface, a second strand groove is formed at a position corresponding to the first strand groove. a stranded cable in which a plurality of elemental wires each composed of steel are twisted together; an anti-corrosive coating having an outer circumferential portion that coats an outer circumference of the stranded cable; an optical fiber provided at a position inwardly of an outer circumferential surface of the anti-corrosive coating and corresponding to a first strand groove in the stranded cable so as to follow expansion and contraction of the stranded cable, the optical fiber being a sensor for measuring strain of the plurality of elemental wires; and an outer coating that coats an outer circumference of the anti-corrosive coating, the stranded cable having an outer circumferential elemental wire located at an outermost circumference of the stranded cable, and an inner circumferential elemental wire or central elemental wire adjacent to the outer circumferential elemental wire, the anti-corrosive coating having a filler portion provided at a triple point surrounded by the outer circumferential elemental wire and the inner circumferential elemental wire or the central elemental wire, the outer circumferential elemental wire includes adjacent outermost circumferential elemental wires, characterized in that the optical fiber is disposed at the first strand groove formed between the adjacent outermost circumferential elemental wires, the outer circumferential portion has a surface along an outer circumferential outline of the stranded cable, and in the surface, a second strand groove is formed at a position corresponding to the first strand groove.