The present invention addresses the problem of providing a cooked rice wrapping material that can be accurately and easily formed into a deformed conical shape having a constant apex angle. The solution provides a cooked rice wrapping material (10) having a rectangular shape which, when used, is formed into a deformed conical shape having an apex formed by an intermediate part of one long side (10d), the deformed conical shape being formed by: rolling a part forming one corner part (A) located between one short side (10a) and the one long side (10d) as an inside rolled part (22) in such a way that the one corner part (A) is placed at an intermediate part of the opposite, other long side (10c); rolling a part on the other short side (10b) over the inside rolled part (22) as an outside rolled part (24); and fixing the outside rolled part (24) onto the inside rolled part (22). The cooked rice wrapping material (10) is characterized in that an outer film (14) is provided with a first mark (32a) for positioning th
