This invention relates to a process of manufacturing a cellulose molding, a plant component extracting apparatus and a process of manufacturing cellulose acetate. In one embodiment of the invention, the process of manufacturing a cellulose molding comprises steaming corncob meal at a temperature of 150 to 250.degree. C. and a pressure of 20 to 29 MPa, filtering the steamed corncob meal with a filtering device to obtain a solid and molding the solid.