PURPOSE: To obtain a fibrous composite sheet capable of forming a molded article having a superior strength and a uniform wall thickness.

CONSTITUTION: Parallel 12 glass rovings F each made of a large number of continuous monofilaments are passed through a fluid bed R of a powder vinyl chloride resin 9 while being fibrillated, thereby being impregnated with the vinyl chloride resin 9. The fibrillated resin-impregnated glass rovings are melted under heat to a sheet form. This is cooled and set to form a glass-fiber reinforced vinyl chloride sheet. At this time, parallel glass rovings F to be introduced into the fluid bed R are alternately divided into two groups. The groups are separately passed through guide bars 12A, 12B, 13A, 13B arranged in pairs on different positions in the fluid bed R for every group in pressure contact with the guide bars. After that, the glass rovings of the respective groups FA, FB are led to a common guide bar 14. The adjacent side edges of the fibrillated glass rovings are overlapped with each other.