PROBLEM TO BE SOLVED: To provide a copper foil for a flexible printed substrate, having good linear circuit properties and suitable for a minute circuit, and a copper-clad laminate, a flexible printed substrate and an electronic device using same. SOLUTION: A copper foil for a flexible printed substrate, which is a rolled copper foil comprising at least 99.96 mass percent Cu, with the remainder being unavoidable impurities, wherein when 300 degrees centigrade heat treatment is carried out for 30 minutes and a measurement field of view of 150 micrometres x 150 micrometres of the rolling surface of the rolled copper foil is subjected to EBSD measurement, the average crystal diameter, when a misorientation of 5 degrees or more is considered a crystal boundary, is not more than 5.0 micrometres.

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