Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery comprising an electrode assembly having a structure in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween, wherein

• a porous filler layer formed on a surface of the separator is disposed between the positive electrode and the separator,
• the filler layer contains a filler made of an inorganic material and contains a binder,
• an average particle diameter of the filler is from at least 0.5 μm to not more than 2 μm,
• the proportion of the filler in the filler layer as a whole is at least 90 mass %,
• an average thickness T of the filler layer is from at least 6 μm to not more than 20 μm, an average particle diameter D of a positive electrode active material present in the positive electrode facing the filler layer is at least 1 μm, and the relationship T>D holds, and
• a pressure applied to the electrode assembly in the stacking direction is set to at least 0.1 MPa.