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 the part on the other short side (10b) that is rolled as the outside rolled part (24) when the deformed conical shape is being formed.
