A high-density ethylene-based polymer produced by polymerization of ethylene and at least one monomer selected from the group consisting of α-olefin-based monomers, wherein a density according to ASTM D1505 is 0.930 g/cm 3 to 0.955 g/cm 3 , an MI according to ASTM D1238 is 0.1 g/10 min to 10 g/10 min, a weight average molecular weight (g/mol) is 60,000 to 250,000, a molecular weight distribution (Mw/Mn) is 4 to 6, and an average thickness of lamellar is 9 nm to 11 nm and a lamellar distribution (Lw/Ln) is 1.1 or more, wherein the lamellar thickness and thickness distribution (Lw/Ln) are measured as described in the description, wherein the MI is an amount of extrusion for 10 minutes at a load of 2.16 kg and is measured at a measurement temperature of 190°C according to ASTM D1238, wherein, when the high-density ethylene-based polymer is a copolymer of the ethylene and the α-olefin-based monomer, a content of the α-olefin-based monomer is 0.1 wt% to 10 wt%, wherein 48% to 50% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 12 nm to 13 nm, wherein 15% to 17% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 8 nm to 9 nm, wherein 7% to 9% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 7 nm to 8 nm, wherein 11% to 13% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 5 nm to 6 nm, wherein 6% to 8% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 4 nm to 5 nm, wherein 4% to 6% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 3 nm to 4 nm, and wherein 1% to 3% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 2 nm to 3 nm. wherein a density according to ASTM D1505 is 0.930 g/cm 3 to 0.955 g/cm 3 , an MI according to ASTM D1238 is 0.1 g/10 min to 10 g/10 min, a weight average molecular weight (g/mol) is 60,000 to 250,000, a molecular weight distribution (Mw/Mn) is 4 to 6, and an average thickness of lamellar is 9 nm to 11 nm and a lamellar distribution (Lw/Ln) is 1.1 or more, wherein the lamellar thickness and thickness distribution (Lw/Ln) are measured as described in the description, wherein the MI is an amount of extrusion for 10 minutes at a load of 2.16 kg and is measured at a measurement temperature of 190°C according to ASTM D1238, wherein, when the high-density ethylene-based polymer is a copolymer of the ethylene and the α-olefin-based monomer, a content of the α-olefin-based monomer is 0.1 wt% to 10 wt%, wherein 48% to 50% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 12 nm to 13 nm, wherein 15% to 17% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 8 nm to 9 nm, wherein 7% to 9% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 7 nm to 8 nm, wherein 11% to 13% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 5 nm to 6 nm, wherein 6% to 8% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 4 nm to 5 nm, wherein 4% to 6% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 3 nm to 4 nm, and wherein 1% to 3% of the lamellar in the high-density ethylene-based polymer has a thickness in a range of 2 nm to 3 nm. <EOS>