A high strength steel sheet satisfying, in mass%: C: 0.10% to 0.5%, Si: 1.0% to 3%, Mn: 1.5% to 3%, P: more than 0% and 0.1% or less, S: more than 0% and 0.05% or less, Al: 0.005% to 1 %, and N: more than 0% and 0.01% or less, and optionally one or more selected from the group consisting of, in mass%: Cr: more than 0% and 1% or less, Mo: more than 0% and 1% or less, Ti: more than 0% and 0.15% or less, Nb: more than 0% and 0.15% or less, V: more than 0% and 0.15% or less, Cu: more than 0% and 1% or less, Ni: more than 0% and 1 % or less, B: more than 0% and 0.005% or less, Ca: more than 0% and 0.01% or less, Mg: more than 0% and 0.01% or less, and a rare earth element: more than 0% and 0.01% or less, with a balance being iron and inevitable impurities, wherein a metal structure of the steel sheet comprises polygonal ferrite, bainite, tempered martensite, retained austenite, and balance structures; when the metal structure is observed with a scanning electron microscope, the metal structure satisfies: polygonal ferrite: 10 to 50 area%, bainite: 10 to 50 area%, tempered martensite: 10 to 80 area%, and balance structures: 25 area% or less with respect to the metal structure overall; and when the metal structure is measured by X-ray diffractometry, the metal structure satisfies: retained austenite: 5.0 volume% or more, retained austenite with a carbon concentration of 1.0 mass% or less: 3.5 volume% or more, and retained austenite with a carbon concentration of 0.8 mass% or less: 2.4 volume% or less, with respect to the metal structure overall, wherein the volume ratio of retained austenite, the volume ratio of retained austenite with a carbon concentration of 1.0 mass% or more, and the volume ratio of retained austenite with a carbon concentration of 0.8 mass% or less are measured with the method described in the description. C: 0.10% to 0.5%, Si: 1.0% to 3%, Mn: 1.5% to 3%, P: more than 0% and 0.1% or less, S: more than 0% and 0.05% or less, Al: 0.005% to 1 %, and N: more than 0% and 0.01% or less, and optionally one or more selected from the group consisting of, in mass%: Cr: more than 0% and 1% or less, Mo: more than 0% and 1% or less, Ti: more than 0% and 0.15% or less, Nb: more than 0% and 0.15% or less, V: more than 0% and 0.15% or less, Cu: more than 0% and 1% or less, Ni: more than 0% and 1 % or less, B: more than 0% and 0.005% or less, Ca: more than 0% and 0.01% or less, Mg: more than 0% and 0.01% or less, and a rare earth element: more than 0% and 0.01% or less, Cr: more than 0% and 1% or less, Mo: more than 0% and 1% or less, Ti: more than 0% and 0.15% or less, Nb: more than 0% and 0.15% or less, V: more than 0% and 0.15% or less, Cu: more than 0% and 1% or less, Ni: more than 0% and 1 % or less, B: more than 0% and 0.005% or less, Ca: more than 0% and 0.01% or less, Mg: more than 0% and 0.01% or less, and a rare earth element: more than 0% and 0.01% or less, a metal structure of the steel sheet comprises polygonal ferrite, bainite, tempered martensite, retained austenite, and balance structures; when the metal structure is observed with a scanning electron microscope, the metal structure satisfies: polygonal ferrite: 10 to 50 area%, bainite: 10 to 50 area%, tempered martensite: 10 to 80 area%, and balance structures: 25 area% or less with respect to the metal structure overall; and polygonal ferrite: 10 to 50 area%, bainite: 10 to 50 area%, tempered martensite: 10 to 80 area%, and balance structures: 25 area% or less when the metal structure is measured by X-ray diffractometry, the metal structure satisfies: retained austenite: 5.0 volume% or more, retained austenite with a carbon concentration of 1.0 mass% or less: 3.5 volume% or more, and retained austenite with a carbon concentration of 0.8 mass% or less: 2.4 volume% or less, with respect to the metal structure overall, retained austenite: 5.0 volume% or more, retained austenite with a carbon concentration of 1.0 mass% or less: 3.5 volume% or more, and retained austenite with a carbon concentration of 0.8 mass% or less: 2.4 volume% or less, with respect to the metal structure overall,