Lithium secondary battery

A lithium secondary battery includes a positive electrode, a negative electrode, and a porous separator disposed between the positive electrode and the negative electrode, a spacer disposed between the separator and at least one of the positive electrode and the negative electrode, and a non-aqueous electrolyte having lithium ion conductivity. In the negative electrode, the lithium metal deposits during charging, and the lithium metal dissolves during discharging. In a region where the negative electrode and the positive electrode face each other, a first region (R) facing the spacer and a second region (R) not facing the spacer are included. The spacer is nonporous or porous, and the spacer has a height (t) of 20 μm or more. When the spacer is porous, the spacer has a porosity Psp, the porosity Psp of the spacer being equal to or less than a porosity Pse the separator.