Collector for lithium ion secondary batteries and positive electrode for lithium ion secondary batteries

This collector for lithium ion secondary batteries, which is used in a lithium ion secondary battery and on which an electrode mixture layer is formed, satisfies relational expressions A ≥ 0.10 μm and 6 ≤ (B/A) ≤ 15, where A is the three-dimensional center plane average roughness (SRa) of at least one surface of the collector, on said surface the electrode mixture layer being formed, and B is the ratio of the actual surface area relative to the geometric area of the collector surface, namely (actual surface area)/(geometric area).