A non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a first separator layer provided between the positive electrode and the negative electrode, the first separator layer facing the positive electrode, a second separator layer provided between the positive electrode and the negative electrode, the second separator layer facing the negative electrode, and a non-aqueous electrolyte held in the first separator layer and the second separator layer. The variable α represents the porosity of the first separator layer, and the variable β represents the porosity of the second separator layer, such that α≤90% and the following expression is satisfied: 2≤α/β≤2.85.