The present invention relates to an insulating member, a method for manufacturing an insulating member, and a method for manufacturing a cylindrical battery comprising an insulating member. More particularly, the present invention relates to an insulating member, a method for manufacturing an insulating member, and a method for manufacturing a cylindrical battery comprising an insulating member, the insulating member being characterized by comprising: a substrate comprising multiple glass fiber strands intersecting with each other such that the substrate is configured in a plate-shaped meshedstructure having pore portions; and a binder with which the outer surfaces of the glass fiber strands are coated.