An electrolytic copper foil, which includes a first surface and a second surface opposite the first surface, the electrolytic copper foil comprising: a copper layer including a matte surface facing the first surface and a shiny surface facing the second surface; a first protective layer on the matte surface of the copper layer; and a second protective layer on the shiny surface of the copper layer, wherein: a coefficient of thermal expansion of the electrolytic foil, which is measured using a thermomechanical analyzer (TMA) while heating the electrolytic copper foil from 30 °C to 190 °C at a speed of 5 °C/min, ranges from 16 to 22 μm/(m·°C); a tensile strength of the electrolytic copper foil, which is measured after a heat treatment at a temperature of 190 °C for 1 hour, ranges from 21 to 36 kgf/mm 2 ; and a weight deviation of the electrolytic copper foil is 5% or less, wherein the weight deviation is obtained by taking 5 cm x 5 cm samples at three points arranged in a width direction of the electrolytic copper foil, measuring a weight of each of the samples to calculate a weight per unit area, calculating an average weight and a standard deviation of the weights from the weights per unit area of the three samples, and calculating a ratio (%) of the standard deviation of the weights to the average weight [(standard deviation of weights / average weight) x100]. a copper layer including a matte surface facing the first surface and a shiny surface facing the second surface; a first protective layer on the matte surface of the copper layer; and a second protective layer on the shiny surface of the copper layer, wherein: a coefficient of thermal expansion of the electrolytic foil, which is measured using a thermomechanical analyzer (TMA) while heating the electrolytic copper foil from 30 °C to 190 °C at a speed of 5 °C/min, ranges from 16 to 22 μm/(m·°C); a tensile strength of the electrolytic copper foil, which is measured after a heat treatment at a temperature of 190 °C for 1 hour, ranges from 21 to 36 kgf/mm 2 ; and a weight deviation of the electrolytic copper foil is 5% or less, wherein the weight deviation is obtained by taking 5 cm x 5 cm samples at three points arranged in a width direction of the electrolytic copper foil, measuring a weight of each of the samples to calculate a weight per unit area, calculating an average weight and a standard deviation of the weights from the weights per unit area of the three samples, and calculating a ratio (%) of the standard deviation of the weights to the average weight [(standard deviation of weights / average weight) x100]. a coefficient of thermal expansion of the electrolytic foil, which is measured using a thermomechanical analyzer (TMA) while heating the electrolytic copper foil from 30 °C to 190 °C at a speed of 5 °C/min, ranges from 16 to 22 μm/(m·°C); a tensile strength of the electrolytic copper foil, which is measured after a heat treatment at a temperature of 190 °C for 1 hour, ranges from 21 to 36 kgf/mm 2 ; and a weight deviation of the electrolytic copper foil is 5% or less, wherein the weight deviation is obtained by taking 5 cm x 5 cm samples at three points arranged in a width direction of the electrolytic copper foil, measuring a weight of each of the samples to calculate a weight per unit area, calculating an average weight and a standard deviation of the weights from the weights per unit area of the three samples, and calculating a ratio (%) of the standard deviation of the weights to the average weight [(standard deviation of weights / average weight) x100]. <EOS>