To provide a method and an apparatus for a fiber sheet capable of homogeneously opening and widening fibers, having even thickness, free from the troubles of meandering and forming holes and continuously producing a well-arranged fiber bundle sheet in which a resin is uniformly impregnated.

Plural fiber bundles 1 which are arranged in parallel to each other are passed on plural rollers 5 under tensile strength while they are bent with a specified angle, and the bundles 1 are opened and widened by this process to obtain a fiber sheet-shaped material. Then, a resin is applied on the sheet- shaped material by a rotary body 7, and subsequently it is pulled by pulling rollers 10 at a specified speed to produce the objective fiber sheet. In this process, plural fiber sheets opened and widened are fed to each dram-shaped roller of a ribbed crown roller 6 which is composed of plural dram-shaped rollers each having tapers with small diameters at both ends and arranged to each other in the direction of an axis having a rib between rollers. Further, the surface speed of the rotary body 7 is set higher than the running speed of the fiber sheet-shaped material.