A heat-treated steel sheet member having a chemical composition comprising, by mass%: C: 0.05 to 0.50%; Si: 0.50 to 5.0%; Mn: 1.5 to 4.0%; P: 0.05% or less; S: 0.05% or less; N: 0.01% or less; Ti: 0.01 to 0.10%; B: 0.0005 to 0.010%; Cr: 0 to 1.0%; Ni: 0 to 2.0%; Cu: 0 to 1.0%; Mo: 0 to 1.0%; V: 0 to 1.0%; Ca: 0 to 0.01%; Al: 0 to 1.0%; Nb: 0 to 1.0%; REM: 0 to 0.1%; and the balance: Fe and impurities, wherein the steel sheet member has a steel micro-structure comprising: martensite of which a volume ratio is 90% or higher as measured by etching with Nital and observation under an optical microscope; and retained austenite of which a volume ratio is 5.0% or higher as measured by x-ray diffraction, a number density of retained carbide being present in the steel sheet member and each having circle-equivalent diameters of 0.1 μm or larger is 4.0 × 10 3 /mm 2 or lower, the number density of retained carbide being determined by: etching the surface of a steel sheet for heat treatment using a picral solution, magnifying 2000 times under a scanning electron microscope, observing in a plurality of visual fields and counting the number of visual fields where carbides having circle-equivalent diameters of 0.1 μm or larger with an aspect ratio of 3 or lower were present, and a number per 1 mm 2 being calculated, a value of strain induced transformation parameter k expressed by a following formula (i) is less than 20.0 when following mechanical properties are measured using a sheet specimen specified in ASTM E8, a tensile strength is 1.4 GPa or higher, and a total elongation is 8.0% or higher: k = log f γ 0 − log f γ 0.02 / 0.02 where meaning of each symbol in the above formula is as follows: f γ0: Volume ratio of retained austenite present in the steel sheet member f γ (0.02): Volume ratio of retained austenite present in the steel sheet member after a true strain of 0.02 is applied to and unloaded from the member. C: 0.05 to 0.50%; Si: 0.50 to 5.0%; Mn: 1.5 to 4.0%; P: 0.05% or less; S: 0.05% or less; N: 0.01% or less; Ti: 0.01 to 0.10%; B: 0.0005 to 0.010%; Cr: 0 to 1.0%; Ni: 0 to 2.0%; Cu: 0 to 1.0%; Mo: 0 to 1.0%; V: 0 to 1.0%; Ca: 0 to 0.01%; Al: 0 to 1.0%; Nb: 0 to 1.0%; REM: 0 to 0.1%; and the balance: Fe and impurities, wherein the steel sheet member has a steel micro-structure comprising: martensite of which a volume ratio is 90% or higher as measured by etching with Nital and observation under an optical microscope; and retained austenite of which a volume ratio is 5.0% or higher as measured by x-ray diffraction, a number density of retained carbide being present in the steel sheet member and each having circle-equivalent diameters of 0.1 μm or larger is 4.0 × 10 3 /mm 2 or lower, the number density of retained carbide being determined by: etching the surface of a steel sheet for heat treatment using a picral solution, magnifying 2000 times under a scanning electron microscope, observing in a plurality of visual fields and counting the number of visual fields where carbides having circle-equivalent diameters of 0.1 μm or larger with an aspect ratio of 3 or lower were present, and a number per 1 mm 2 being calculated, a value of strain induced transformation parameter k expressed by a following formula (i) is less than 20.0 when following mechanical properties are measured using a sheet specimen specified in ASTM E8, a tensile strength is 1.4 GPa or higher, and a total elongation is 8.0% or higher: k = log f γ 0 − log f γ 0.02 / 0.02 where meaning of each symbol in the above formula is as follows: f γ0: Volume ratio of retained austenite present in the steel sheet member f γ (0.02): Volume ratio of retained austenite present in the steel sheet member after a true strain of 0.02 is applied to and unloaded from the member. martensite of which a volume ratio is 90% or higher as measured by etching with Nital and observation under an optical microscope; and retained austenite of which a volume ratio is 5.0% or higher as measured by x-ray diffraction, a number density of retained carbide being present in the steel sheet member and each having circle-equivalent diameters of 0.1 μm or larger is 4.0 × 10 3 /mm 2 or lower, the number density of retained carbide being determined by: etching the surface of a steel sheet for heat treatment using a picral solution, magnifying 2000 times under a scanning electron microscope, observing in a plurality of visual fields and counting the number of visual fields where carbides having circle-equivalent diameters of 0.1 μm or larger with an aspect ratio of 3 or lower were present, and a number per 1 mm 2 being calculated, a value of strain induced transformation parameter k expressed by a following formula (i) is less than 20.0 when following mechanical properties are measured using a sheet specimen specified in ASTM E8, a tensile strength is 1.4 GPa or higher, and a total elongation is 8.0% or higher: k = log f γ 0 − log f γ 0.02 / 0.02 where meaning of each symbol in the above formula is as follows: f γ0: Volume ratio of retained austenite present in the steel sheet member f γ (0.02): Volume ratio of retained austenite present in the steel sheet member after a true strain of 0.02 is applied to and unloaded from the member. f γ0: Volume ratio of retained austenite present in the steel sheet member f γ (0.02): Volume ratio of retained austenite present in the steel sheet member after a true strain of 0.02 is applied to and unloaded from the member.