An actinic ray-sensitive or radiation-sensitive composition comprising: a cation having a metal atom; and a ligand, wherein a value of σ represented by Equation is 2.2 or less for a metal atom having the highest mass content ratio in the cation, and the metal atom having the highest mass content ratio in the cation is hafnium, zirconium or tin, wherein when the metal atom having the highest mass content ratio is hafnium, the σ value is 1.2 or less, when the metal atom having the highest mass content ratio is zirconium, the σ value is 1.6 or less, and when the metal atom having the highest mass content ratio is tin, the σ value is 2.0 or less, σ = ∑ k = 1 N μ − x k 2 × y k in Equation, N represents the number of the types of isotopes of the metal atom having the highest mass content ratio, and for N types of isotopes, the mass numbers are represented by x 1, x 2, x 3,..., and x N in order from the smallest to the largest, and the existence ratios corresponding to these mass numbers are represented by y 1, y 2, y 3,..., and y N, respectively, with y 1 +y 2 +y 3 +...+y N =1, the average mass number μ is represented by Equation, k represents an integer of 1 to N, x k represents the mass number of the k-th isotope in order from the smallest mass number, y k represents the existence ratio of the k-th isotope in order from the smallest mass number, μ = ∑ i = 1 N x i × y i in Equation, N represents the number of the types of isotopes of the metal atom having the highest mass content ratio, i represents an integer of 1 to N, x i represents the mass number of the i-th isotope in order from the smallest mass number, and y i represents the existence ratio of the i-th isotope in order from the smallest mass number. a cation having a metal atom; and a ligand, wherein a value of σ represented by Equation is 2.2 or less for a metal atom having the highest mass content ratio in the cation, and the metal atom having the highest mass content ratio in the cation is hafnium, zirconium or tin, wherein when the metal atom having the highest mass content ratio is hafnium, the σ value is 1.2 or less, when the metal atom having the highest mass content ratio is zirconium, the σ value is 1.6 or less, and when the metal atom having the highest mass content ratio is tin, the σ value is 2.0 or less, σ = ∑ k = 1 N μ − x k 2 × y k in Equation, N represents the number of the types of isotopes of the metal atom having the highest mass content ratio, and for N types of isotopes, the mass numbers are represented by x 1, x 2, x 3,..., and x N in order from the smallest to the largest, and the existence ratios corresponding to these mass numbers are represented by y 1, y 2, y 3,..., and y N, respectively, with y 1 +y 2 +y 3 +...+y N =1, the average mass number μ is represented by Equation, k represents an integer of 1 to N, x k represents the mass number of the k-th isotope in order from the smallest mass number, y k represents the existence ratio of the k-th isotope in order from the smallest mass number, μ = ∑ i = 1 N x i × y i in Equation, N represents the number of the types of isotopes of the metal atom having the highest mass content ratio, i represents an integer of 1 to N, x i represents the mass number of the i-th isotope in order from the smallest mass number, and y i represents the existence ratio of the i-th isotope in order from the smallest mass number. N represents the number of the types of isotopes of the metal atom having the highest mass content ratio, and for N types of isotopes, the mass numbers are represented by x 1, x 2, x 3,..., and x N in order from the smallest to the largest, and the existence ratios corresponding to these mass numbers are represented by y 1, y 2, y 3,..., and y N, respectively, with y 1 +y 2 +y 3 +...+y N =1, the average mass number μ is represented by Equation, k represents an integer of 1 to N, x k represents the mass number of the k-th isotope in order from the smallest mass number, y k represents the existence ratio of the k-th isotope in order from the smallest mass number, N represents the number of the types of isotopes of the metal atom having the highest mass content ratio, i represents an integer of 1 to N, x i represents the mass number of the i-th isotope in order from the smallest mass number, and y i represents the existence ratio of the i-th isotope in order from the smallest mass number.