A secondary battery separator includes a porous base material; and a porous layer stacked on at least one surface of the porous base material, the porous layer being mainly composed of inorganic particles, and two or more organic resins having different melting points, the porous layer including a fluororesin as at least one of the organic resins, the secondary battery separator satisfying at least one of (A) and/or (B): (A) the porous layer has a melting point of 130° C. or higher and 20° C. or higher and lower than 130° C.; and (B) the porous layer has a melting point of 130° C. or higher, and includes an amorphous organic resin.