The present invention has as its technical issue to secure not only mechanical strength but also conductivity by increasing the contact area with the positive electrode active substance or positive electrode mixture while also securing corrosion resistance to alkali or an electrolytic solution when applying stainless steel foil to a current collector for a positive electrode of a secondary battery so as to deal with the increasingly higher capacities and smaller sizes and lighter weights of lithium ion secondary batteries and has as its object the provision of a current collector for a positive electrode of a secondary battery using such stainless steel foil. The invention is a current collector comprised of stainless steel foil made to decrease in surface hardness while obtaining corrosion resistance by giving it a chemical composition decreased in Cr and containing a trace amount of Sn or a chemical composition containing Ti, a thickness of 1 μm or more and 20 μm or less, and a surface hardness of a Vickers hardness of Hv300 or less applied to a secondary battery positive electrode. When measuring an electrical contact resistance between the positive electrode active substance and the current collector after pressing, when the filling ratio of the positive electrode mixture is 74%, the electrical contact resistance is 100Ω or less. In particular, that effect is exhibited when the density of the positive electrode mixture is 3.0 g/cm3 or more (filling ratio: 50% or more).