Abstract: A rolled copper foil composed of crystal particles of copper or a copper alloy, wherein an average particle size of the crystal particles composing the outermost surface is not less than 0.2 ?m and not greater than 6 ?m; a ratio of the average particle size of the crystal particles composing the outermost surface to a thickness of the rolled copper foil is not less than 1% and not greater than 6%; and an intragranular distortion rate found by the following formula (1) when a cross-section perpendicular to a length direction of the rolled copper foil is analyzed by electron backscatter diffraction (EBSD) is not less than 0.5% and not greater than 10%.