A method for charging a secondary battery comprising a cathode current collecting foil, a cathode active material layer, a solid electrolyte layer and an anode current collecting foil in this order and using a lithium metal precipitation-dissolution reaction as an anode reaction, characterized in that the charging method is a two-step secondary battery charging method comprising a first charging and a second charging, wherein the method further comprises calculating a state-of-charge value of the secondary battery based on a temperature T, current density I and voltage V of the secondary battery after measuring the temperature T, the current density I and the voltage V; wherein, if the SOC is a predetermined threshold value (SOC (pre-Li)) or less, first charging in which, by charging the secondary battery at a first current density I1 (mA/cm 2), a lithium metal is precipitated on an anode current collecting foil-side surface of the solid electrolyte layer to form a roughness coating layer which is a part of an anode active material layer and which is composed of the lithium metal, is carried out; wherein, if the SOC is more than the threshold value, second charging in which the secondary battery is charged at a second current density 12 which is larger than the first current density I1 to increase a thickness of the roughness coating layer, is carried out; and wherein the threshold value satisfies the following formula: SOC pre − Li % = S × Y / 10000 × D × Z / 2 / M × 100 where S is an area (cm 2) of the anode; Y is a roughness height (μm) of the anode current collecting foil-side surface of the solid electrolyte layer; D is a density (g/cm 3) of the lithium metal; Z is a theoretical capacity (mAh/g) of the lithium metal; and M is a capacity (mAh) of the secondary battery. the charging method is a two-step secondary battery charging method comprising a first charging and a second charging, wherein the method further comprises calculating a state-of-charge value of the secondary battery based on a temperature T, current density I and voltage V of the secondary battery after measuring the temperature T, the current density I and the voltage V; wherein, if the SOC is a predetermined threshold value (SOC (pre-Li)) or less, first charging in which, by charging the secondary battery at a first current density I1 (mA/cm 2), a lithium metal is precipitated on an anode current collecting foil-side surface of the solid electrolyte layer to form a roughness coating layer which is a part of an anode active material layer and which is composed of the lithium metal, is carried out; wherein, if the SOC is more than the threshold value, second charging in which the secondary battery is charged at a second current density 12 which is larger than the first current density I1 to increase a thickness of the roughness coating layer, is carried out; and wherein the threshold value satisfies the following formula: SOC pre − Li % = S × Y / 10000 × D × Z / 2 / M × 100 where S is an area (cm 2) of the anode; Y is a roughness height (μm) of the anode current collecting foil-side surface of the solid electrolyte layer; D is a density (g/cm 3) of the lithium metal; Z is a theoretical capacity (mAh/g) of the lithium metal; and M is a capacity (mAh) of the secondary battery.