PURPOSE: To provide a reinforced fiber sheet which can lengthen a usable time of a matrix resin to be infiltrated into a reinforcing fiber and shorten a setting time.

CONSTITUTION: In a unidirectionally reinforced fiber sheet 1, a reinforcing fiber 4 is provided on a substrate sheet 2 having mold release properties by arranging unidirectionally through a binder layer 3 and a curing accelerating agent layer 5 is applied onto the reinforcing fiber 4. When a matrix resin is infiltrated into the reinforcing resin 4 on the curing accelerating agent layer 5, a curing accelerating agent is eluted easily into the resin, mixed favorably into the resin and a curing agent compounded with the resin, curing is initiated immediately and cured in a short time.