Use of a cyclic olefin copolymer composition for producing a circuit substrate, the cyclic olefin copolymer composition comprising: a cyclic olefin copolymer (m); and a cyclic olefin copolymer (n) different from the cyclic olefin copolymer (m), wherein the cyclic olefin copolymer (m) includes a repeating unit derived from one or more olefins represented by General Formula, a repeating unit derived from one or more cyclic non-conjugated dienes represented by General Formula, and a repeating unit derived from one or more cyclic olefins represented by General Formula, when a total molar number of the repeating units in the cyclic olefin copolymer (m) is 100 mol%, a content of the repeating unit derived from the olefins is 10 mol% or more to 90 mol% or less, a content of the repeating unit derived from the cyclic non-conjugated dienes is 1 mol% or more to 40 mol% or less, and a content of the repeating unit derived from the cyclic olefins is 1 mol% or more to 30 mol% or less, the cyclic olefin copolymer (n) includes at least one selected from a copolymer of ethylene or α-olefin and cyclic olefin (where the copolymer does not include a repeating unit derived from cyclic non-conjugated dienes represented by General Formula and a cyclic olefin ring-opening polymer, and when a total amount of the cyclic olefin copolymer (m) and the cyclic olefin copolymer (n) is 100% by mass, a content of the cyclic olefin copolymer (m) is 5% by mass or more to 95% by mass or less, and a content of the cyclic olefin copolymer (n) is 5% by mass or more to 95% by mass or less. (in General Formula, R 300 indicates a hydrogen atom or a linear or branched hydrocarbon group having 1 to 29 carbon atoms) (in General Formula, u is 0 or 1, v is 0 or a positive integer, w is 0 or 1, R 61 to R 76 and R a1 and R b1, which may be the same or different, are a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, R 104 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, t is a positive integer of 0 to 10, and R 75 and R 76 may bond with each other to form a monocyclic or polycyclic ring) (in General Formula, u is 0 or 1, v is 0 or a positive integer, w is 0 or 1, R 61 to R 78 and R a1 and R b1, which may be the same or different, are a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, and R 75 to R 78 may bond with each other to form a monocyclic or polycyclic ring) a cyclic olefin copolymer (m); and a cyclic olefin copolymer (n) different from the cyclic olefin copolymer (m), wherein the cyclic olefin copolymer (m) includes a repeating unit derived from one or more olefins represented by General Formula, a repeating unit derived from one or more cyclic non-conjugated dienes represented by General Formula, and a repeating unit derived from one or more cyclic olefins represented by General Formula, a repeating unit derived from one or more olefins represented by General Formula, a repeating unit derived from one or more cyclic non-conjugated dienes represented by General Formula, and a repeating unit derived from one or more cyclic olefins represented by General Formula, when a total molar number of the repeating units in the cyclic olefin copolymer (m) is 100 mol%, a content of the repeating unit derived from the olefins is 10 mol% or more to 90 mol% or less, a content of the repeating unit derived from the cyclic non-conjugated dienes is 1 mol% or more to 40 mol% or less, and a content of the repeating unit derived from the cyclic olefins is 1 mol% or more to 30 mol% or less, the cyclic olefin copolymer (n) includes at least one selected from a copolymer of ethylene or α-olefin and cyclic olefin (where the copolymer does not include a repeating unit derived from cyclic non-conjugated dienes represented by General Formula and a cyclic olefin ring-opening polymer, and when a total amount of the cyclic olefin copolymer (m) and the cyclic olefin copolymer (n) is 100% by mass, a content of the cyclic olefin copolymer (m) is 5% by mass or more to 95% by mass or less, and a content of the cyclic olefin copolymer (n) is 5% by mass or more to 95% by mass or less. (in General Formula, R 300 indicates a hydrogen atom or a linear or branched hydrocarbon group having 1 to 29 carbon atoms) (in General Formula, u is 0 or 1, v is 0 or a positive integer, w is 0 or 1, R 61 to R 76 and R a1 and R b1, which may be the same or different, are a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, R 104 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, t is a positive integer of 0 to 10, and R 75 and R 76 may bond with each other to form a monocyclic or polycyclic ring) (in General Formula, u is 0 or 1, v is 0 or a positive integer, w is 0 or 1, R 61 to R 78 and R a1 and R b1, which may be the same or different, are a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, and R 75 to R 78 may bond with each other to form a monocyclic or polycyclic ring)