A thermoplastic elastomer composition comprising: at least one selected from an ethylene copolymer comprising 50% by weight to 95% by weight of monomer units derived from ethylene and 5% by weight to 50% by weight of monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 to 10 carbon atoms (component), where the total amount of the monomer units derived from ethylene and the monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 to 10 carbon atoms is taken as 100% by weight, and a copolymer comprising monomer units derived from an aromatic vinyl compound and monomer units derived from a conjugate diene compound (component), a propylene polymer comprising monomer units derived from propylene, wherein the content of the monomer units derived from propylene exceeds 50% by weight (component), where the whole amount of the component is taken as 100% by weight, a phosphoric acid salt compound (component), a phosphoric acid ester (component), and a metal oxide (component), wherein, based on 100 parts by weight in total of the component, the component and the component, the content of the component is 35 parts by weight to 200 parts by weight, the content of the component is 0.1 parts by weight to 40 parts by weight, the content of the component is 0 parts by weight to 20 parts by weight, the weight ratio of the total of the component and the component to the component ((the weight of the component + the weight of the component)/the weight of the component) is from 0.7 to 10, and the weight ratio of the total of the component and the component to the component ((the weight of the component + the weight of the component)/the weight of the component) is from 5 to 70. at least one selected from an ethylene copolymer comprising 50% by weight to 95% by weight of monomer units derived from ethylene and 5% by weight to 50% by weight of monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 to 10 carbon atoms (component), where the total amount of the monomer units derived from ethylene and the monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 to 10 carbon atoms is taken as 100% by weight, and a copolymer comprising monomer units derived from an aromatic vinyl compound and monomer units derived from a conjugate diene compound (component), a propylene polymer comprising monomer units derived from propylene, wherein the content of the monomer units derived from propylene exceeds 50% by weight (component), where the whole amount of the component is taken as 100% by weight, a phosphoric acid salt compound (component), a phosphoric acid ester (component), and a metal oxide (component), wherein, based on 100 parts by weight in total of the component, the component and the component, the content of the component is 35 parts by weight to 200 parts by weight, the content of the component is 0.1 parts by weight to 40 parts by weight, the content of the component is 0 parts by weight to 20 parts by weight, the weight ratio of the total of the component and the component to the component ((the weight of the component + the weight of the component)/the weight of the component) is from 0.7 to 10, and the weight ratio of the total of the component and the component to the component ((the weight of the component + the weight of the component)/the weight of the component) is from 5 to 70.