A method of manufacturing a straight knife includes pressing one end of a rounded austenitic stainless steel rod flat and press-cutting away an excess portion of the flattened end to form a blade grinding the blade to form a slanted surface and an edge along at least a portion of the periphery of the blade removing burrs along the slanted surface and the edge of the blade by electrolytic polishing or chemical polishing and continuing with the electrolytic polishing or chemical polishing to form, at a tip of the slanted surface, a cutting portion of the blade having a cross-sectional shape defined by convex curves.
