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 . <EOS>