[Problem] The purpose of the present invention is to provide an electrolytic foil and a battery current collector capable of suppressing the risk of breakage and tearing during manufacturing due to reduction in film thickness and also exhibiting sufficient strength and stretchability during repetitive charging and discharging of a secondary battery. [Solution] An electrolytic iron foil characterized by being less than 20 µm in thickness, having a first surface and a second surface, and values obtained by dividing three-dimensional surface property parameters Sv of both the first surface and the second surface by the thickness being 0.27 or less.
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