A nonaqueous secondary battery comprising a pair of electrodes consisting of a positive electrode and a negative electrode, and a separator interposed between the pair of electrodes, wherein the separator is a laminate formed by stacking in sequence a metal layer, a first resin layer and a second resin layer having a thermal shrinkage percentage smaller than a thermal shrinkage percentage of the first resin layer, and the metal layer is opposed to one of the pair of electrodes.