There is a problem with a medical knife such as a straight knife made of austenitic stainless steel due to a thin and pointed blade tip portion that when forming an incision in a cornea, a sclera, or the like during ophthalmic surgery, blade tip portion is easily bent. The present invention provides a medical knife capable of improving strength of the thin pointed blade tip portion, and preventing decrease in sharpness. The medical knife of the present invention includes a planar cutting portion and a slanted surface formed along the periphery of at least a part of the cutting portion. The slanted surface is electrolytically polished or chemically polished so as to form a cutting blade constituted by a convex rounded surface on at least an edge of the slanted surface of the knife, and a blade tip is rounded. Since the blade tip is rounded, the blade tip is thick, thereby increasing strength and making it difficult to bend.
