Rolled copper foil, method of manufacturing a rolled copper foil, flexible flat cable, and method of manufacturing a flexible flat cable

A rolled copper foil comprising one of copper and a copper alloy, the rolled copper foil having a rolled surface and two side surfaces adjacent to the rolled surface, each of the side surfaces being a non-sheared surface, wherein

• the rolled copper foil has a width of 0.300 mm to 2.000 mm and a thickness of 0.010 mm to 0.200 mm,
• an area ratio A of crystal grains oriented at a deviation angle of less than or equal to 13° from Cube orientation being greater than or equal to 6%,
• at two end regions each corresponding to 10%-width in a transverse direction, an area ratio B of crystal grains oriented at a deviation angle of less than or equal to 13° from Cube orientation is greater than or equal to 15%,
• wherein the rolled copper foil has a flex life cycle of 500,000 cycles or more,
• the rolled copper foil is hard copper in which stress is accumulated due to plastic working, and
• the rolled copper foil is formed by subjecting a planar wire rod to a finish rolling process so that a thickness reduction ratio Z is 50% or less.