PURPOSE: To provide a woven glass roving for a reinforcing material giving a molded article without deteriorating the appearance of the article in the case of using an unsaturated polyester resin as a matrix resin.

CONSTITUTION: Polyamide fiber yarn having a refractive index close to that of an unsaturated polyester resin used as the matrix resin of FRP is used as a binding thread for a woven glass roving. A molded article having excellent appearance and free from white relief line on the surface of a matrix resin composed of the unsaturated polyester resin can be produced by this process.