Magnesium alloy coil stock

A magnesium alloy coil stock produced by coiling a sheet composed of a magnesium alloy in a cylindrical shape,

• wherein an internal diameter of the coil stock is 400 mm or more and 1000 mm or less, and
• the coil stock satisfies an amount of warpage in a width direction below:
• the amount of warpage in a width direction when the amount of warpage in a width direction % is defined by:
• maximum distance h in vertical direction/width w of test piece for warpage amount×100%,
• the amount of warpage in a width direction is 0.5% or less, wherein, when a sheet located on an outermost peripheral side of the sheet constituting the coil stock is cut into a length of 300 mm to obtain a test piece for warpage amount and the test piece for warpage amount is placed on a horizontal table, the maximum distance in a vertical direction between a surface of the horizontal table and a portion of one surface of the test piece for warpage amount, the portion being not in contact with the horizontal table, in a width direction of the test piece for warpage amount is referred to as h and the width of the test piece for warpage amount is referred to as w,
• wherein the magnesium alloy contains Al as an additive element in an amount of 8.3% or more by mass and 9.5% or less by mass, and
• wherein the coil stock satisfies a flatness below:
• flatness
• when a sheet located on an innermost peripheral side of the sheet constituting the coil stock is cut into a length of 1000 mm to obtain a test piece for flatness and the test piece for flatness is placed on a horizontal table, the maximum distance in a vertical direction between a surface of the horizontal table and a portion of one surface of the test piece for flatness, the portion being not in contact with the horizontal table, is defined as a flatness, the flatness being 5 mm or less.