A rolled copper foil made of one of copper and a copper alloy, characterized in that the rolled copper foil has a rolled surface and two side surfaces adjacent to the rolled surface , each of the side surfaces being a non-sheared surface that is produced when manufacturing the rolled copper foil from a round wire and in which a sheared surface due to slitting is not produced, 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 in an RD surface which is a surface perpendicular to a rolling direction is greater than or equal to 6%, at two end regions in the RD surface , each of the end regions 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%, the area ratio A and the area ratio B are measured by the EBSD method, measurement being carried out under a condition with an approximately 500 μm square measurement region and a scan step of the determination under conditions of 0.5 μm, wherein the measurement area is adjusted using a standard which is to include 200 or more crystal grains, the rolled copper foil has a flex life cycle of 500,000 cycles or more, the flex life cycle being a number of cycles before the rolled copper foil breaks in a bending test that is carried out under a test condition of bend radius R = 6.5 mm, stroke S = ±13 mm, ambient temperature 85°C, and a rotational speed 900 rpm, and the rolled copper foil is made of copper or a copper alloy consisting of a total of less than or equal to 1.0 mass % of at least one element selected from Mg, Zn, Sn, Ag, P, Cr, Si, Zr, Ti, and Fe, the balance being copper and incidental impurities. the rolled copper foil has a rolled surface and two side surfaces adjacent to the rolled surface , each of the side surfaces being a non-sheared surface that is produced when manufacturing the rolled copper foil from a round wire and in which a sheared surface due to slitting is not produced, 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 in an RD surface which is a surface perpendicular to a rolling direction is greater than or equal to 6%, at two end regions in the RD surface , each of the end regions 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%, the area ratio A and the area ratio B are measured by the EBSD method, measurement being carried out under a condition with an approximately 500 μm square measurement region and a scan step of the determination under conditions of 0.5 μm, wherein the measurement area is adjusted using a standard which is to include 200 or more crystal grains, the rolled copper foil has a flex life cycle of 500,000 cycles or more, the flex life cycle being a number of cycles before the rolled copper foil breaks in a bending test that is carried out under a test condition of bend radius R = 6.5 mm, stroke S = ±13 mm, ambient temperature 85°C, and a rotational speed 900 rpm, and the rolled copper foil is made of copper or a copper alloy consisting of a total of less than or equal to 1.0 mass % of at least one element selected from Mg, Zn, Sn, Ag, P, Cr, Si, Zr, Ti, and Fe, the balance being copper and incidental impurities. <EOS>