<p>An electrolytic copper foil, characterized in that 20 % or more of crystals in the lustrous face side thereof have twin structure; a method for manufacturing the electrolytic copper foil by an electrolysis process comprising preparing a separated foil, characterized in that a titanium material having a grain size number of 6.0 is used for a rotary cathode drum and a copper sulfate solution containing 0.2 mg to 20 mg/l of glue and/or gelatin is used as an electrolyte. The use of the electrolytic copper foil can provide a copper foil which exhibits excellent adhesion to an etching resist layer without being subjected to a physical polishing such as buff polishing in the face processing treatment in an etching process for a copper foil circuit.</p>
