To provide a string-shaped article for an industrial material, having sufficient strength and dimensional stability, and excellent light stability.

The string-shaped article for the industrial material comprises a polyethylene naphthalate fiber. The polyethylene naphthalate fiber has 100-200 nm3 of a crystal volume obtained by X-ray wide-angle diffraction of the polyethylene naphthalate fiber, and 30-60% of crystallinity. Preferably, the polyethylene naphthalate fiber contains phosphorus atoms of 0.1-300 mmol% based on the ethylene naphthalate unit, or a metal element. The metal element is preferably one or more kinds of the metal elements selected from the group consisting of group 3-12 metal elements in forth and fifth periods in the periodic table, and Mg, and the strength is preferably 6-11 cN/dtex.