A thermoplastic elastomer composition comprising component defined below, component defined below, and component defined below, wherein the content of the component is 40% by weight to 70% by weight and the combined content of the component and the component is 30% by weight to 60% by weight, where the total of the contents of the components,, and is taken as 100% by weight, and the ratio of the content of the component to the content of the component is 1.1 to 20, component: a polypropylene resin having a content of monomer units derived from propylene of more than 60% by weight but not more than 100% by weight, where the overall amount of the polypropylene resin is taken as 100% by weight; component: a non-conjugated diene copolymer comprising monomer units derived from ethylene, monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms, and monomer units derived from a non-conjugated diene, wherein the content of the monomer units derived from ethylene is 40% by weight to 65% by weight, and the content of the monomer units derived from the at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms is 35% by weight to 60% by weight, where the total of the content of the monomer units derived from ethylene and the content of the monomer units derived from the at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms is taken as 100% by weight, the non-conjugated diene polymer having an iodine value, determined by infrared spectroscopy, of 0.1 to 20, a Mooney viscosity (ML 1+4, 125°C) of 40 to 85, a molecular weight distribution of 1.5 to 3.0, and the eluted amount at -15°C measured by cross-fractionation chromatography is 50% to 99.9% of the overall eluted amount; component: an ethylene copolymer comprising monomer units derived from ethylene and monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms, wherein the content of the monomer units derived from ethylene is 55% by weight to 95% by weight, and the content of the monomer units derived from the at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms is 5% by weight to 45% by weight, where the overall amount of the component is taken as 100% by weight, and the copolymer having a Mooney viscosity (ML 1+4, 125°C) of 20 to 30 and a density of 0.850 g/cm 3 to 0.890 g/cm 3 wherein the Mooney viscosity is measured in accordance with ASTM D-1646 and wherein the molecular weight distribution is a ratio of a weight average molecular weight (Mw) to a number average molecular weight (Mn), both measured by gel permeation chromatography. component: a polypropylene resin having a content of monomer units derived from propylene of more than 60% by weight but not more than 100% by weight, where the overall amount of the polypropylene resin is taken as 100% by weight; component: a non-conjugated diene copolymer comprising monomer units derived from ethylene, monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms, and monomer units derived from a non-conjugated diene, wherein the content of the monomer units derived from ethylene is 40% by weight to 65% by weight, and the content of the monomer units derived from the at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms is 35% by weight to 60% by weight, where the total of the content of the monomer units derived from ethylene and the content of the monomer units derived from the at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms is taken as 100% by weight, the non-conjugated diene polymer having an iodine value, determined by infrared spectroscopy, of 0.1 to 20, a Mooney viscosity (ML 1+4, 125°C) of 40 to 85, a molecular weight distribution of 1.5 to 3.0, and the eluted amount at -15°C measured by cross-fractionation chromatography is 50% to 99.9% of the overall eluted amount; component: an ethylene copolymer comprising monomer units derived from ethylene and monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms, wherein the content of the monomer units derived from ethylene is 55% by weight to 95% by weight, and the content of the monomer units derived from the at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms is 5% by weight to 45% by weight, where the overall amount of the component is taken as 100% by weight, and the copolymer having a Mooney viscosity (ML 1+4, 125°C) of 20 to 30 and a density of 0.850 g/cm 3 to 0.890 g/cm 3