A molding method for a composite sheet (FS) used for manufacturing a thermosetting resin prepreg sheet (PS) in which a thermosetting resin material (R) is impregnated into a fiber sheet (CS), the molding method comprising: bringing a resin transfer sheet (RS) in which a thermosetting resin material (R) is carried on one surface of a transfer sheet (TS) into contact with one surface of the fiber sheet (CS) to be stacked on the fiber sheet (CS), said fiber sheet (CS) being composed of fibers wherein a density of fibers included in a fiber bundle is ρ c g/cm 3 and said fiber sheet (CS) having a base weight of W C g/m 2 , said thermosetting resin material (R) having a density of ρ R g/cm 3 and a predetermined thickness of the thermosetting resin material (R) is such that a base weight of the thermosetting resin material (R) carried on the transferred sheet (TS) is W R g/m 2 ; subjecting the resin transfer sheet (RS) and the fiber sheet (CS) in the stacked state to a heating treatment or heating and pressurizing treatment thereby heating the resin transfer sheet (RS) and the fiber sheet (CS) to a heating temperature; and subjecting the resin transfer sheet (RS) and the fiber sheet (CS) in the heated and stacked state to a cooling treatment or cooling and pressurizing treatment; characterized in that by subjecting the resin transfer sheet (RS) and the fiber sheet (CS) in the heated and stacked state to a cooling treatment or cooling and pressurizing treatment the temperature of the resin transfer sheet (RS) and the fiber sheet (CS) is reduced from the heating temperature to a normal temperature at which the viscosity of the thermosetting resin material (R) is 10000 Pa·s or more; so that the thermosetting resin material (R) is transferred to the fiber sheet (CS) and a portion of the thermosetting resin material (R) is formed in a layered state on one surface side of the fiber sheet (CS) and adhered so as to be integrated to form said composite sheet (FS), and so that a thickness of the composite sheet (FS) is thicker than [{(W C /ρ C )/1000}+{(W R /ρ R )/1000}] mm . bringing a resin transfer sheet (RS) in which a thermosetting resin material (R) is carried on one surface of a transfer sheet (TS) into contact with one surface of the fiber sheet (CS) to be stacked on the fiber sheet (CS), said fiber sheet (CS) being composed of fibers wherein a density of fibers included in a fiber bundle is ρ c g/cm 3 and said fiber sheet (CS) having a base weight of W C g/m 2 , said thermosetting resin material (R) having a density of ρ R g/cm 3 and a predetermined thickness of the thermosetting resin material (R) is such that a base weight of the thermosetting resin material (R) carried on the transferred sheet (TS) is W R g/m 2 ; subjecting the resin transfer sheet (RS) and the fiber sheet (CS) in the stacked state to a heating treatment or heating and pressurizing treatment thereby heating the resin transfer sheet (RS) and the fiber sheet (CS) to a heating temperature; and subjecting the resin transfer sheet (RS) and the fiber sheet (CS) in the heated and stacked state to a cooling treatment or cooling and pressurizing treatment; characterized in that by subjecting the resin transfer sheet (RS) and the fiber sheet (CS) in the heated and stacked state to a cooling treatment or cooling and pressurizing treatment the temperature of the resin transfer sheet (RS) and the fiber sheet (CS) is reduced from the heating temperature to a normal temperature at which the viscosity of the thermosetting resin material (R) is 10000 Pa·s or more; so that the thermosetting resin material (R) is transferred to the fiber sheet (CS) and a portion of the thermosetting resin material (R) is formed in a layered state on one surface side of the fiber sheet (CS) and adhered so as to be integrated to form said composite sheet (FS), and so that a thickness of the composite sheet (FS) is thicker than [{(W C /ρ C )/1000}+{(W R /ρ R )/1000}] mm . <EOS>