An electrochromic device comprising: a first electrode comprising a transparent indium tin oxide film; an electrochromic layer which is disposed on the first electrode and contains an organic/metal hybrid polymer containing at least an organic ligand and a metal ion coordinated to the organic ligand; an electrolyte layer disposed on the electrochromic layer; a counter electrode material layer which is disposed on the electrolyte layer and contains a conductive polymer; and a second electrode comprising a transparent indium tin oxide film and disposed on the counter electrode material layer; wherein the conductive polymer contained in the counter electrode material layer is at least one polymer selected from the group consisting of polypyrroles, polyanilines, polythiophenes, poly(p-phenylene)s, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate)s (PEDOT:PSS), polyfluorenes, poly(p-phenylenevinylene)s, and polythienylenevinylenes; and wherein the organic/metal hybrid polymer is at least one represented by a general formula selected from the group consisting of Formulae, and: wherein in the Formula, M represents a metal ion, X represents a counter anion, S represents a spacer containing a carbon atom and a hydrogen atom or a spacer directly connecting two terpyridine groups, R 1 to R 4 each independently represent a hydrogen atom or a substituent, and n is an integer of 2 or more indicating the degree of polymerization, wherein in the Formula, M 1 to M N (N is an integer of 2 or more) each independently represent a metal ion having different oxidation-reduction potentials, and X 1 to X n (n is an integer of 2 or more) each independently represent a counter anion, S 1 to S N (N is an integer of 2 or more) each independently represent a spacer containing a carbon atom and a hydrogen atom or a spacer directly connecting two terpyridine groups, R 1 1 to R 1 N, R 2 1 to R 2 N, R 3 1 to R 3 N, and R 4 1 to R 4 N (N is an integer of 2 or more) each independently represent a hydrogen atom or a substituent, and n 1 to n N are each independently an integer of 2 or more indicating the degree of polymerization, and wherein in the Formula, M represents a metal ion, X represents a counter anion, A represents a spacer containing a carbon atom and a hydrogen atom or a spacer directly connecting two phenanthroline groups, R 1 to R 4 each independently represent a hydrogen atom or a substituent, and n is an integer of 2 or more indicating the degree of polymerization. a first electrode comprising a transparent indium tin oxide film; an electrochromic layer which is disposed on the first electrode and contains an organic/metal hybrid polymer containing at least an organic ligand and a metal ion coordinated to the organic ligand; an electrolyte layer disposed on the electrochromic layer; a counter electrode material layer which is disposed on the electrolyte layer and contains a conductive polymer; and a second electrode comprising a transparent indium tin oxide film and disposed on the counter electrode material layer; wherein the conductive polymer contained in the counter electrode material layer is at least one polymer selected from the group consisting of polypyrroles, polyanilines, polythiophenes, poly(p-phenylene)s, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate)s (PEDOT:PSS), polyfluorenes, poly(p-phenylenevinylene)s, and polythienylenevinylenes; and wherein the organic/metal hybrid polymer is at least one represented by a general formula selected from the group consisting of Formulae, and: wherein in the Formula, M represents a metal ion, X represents a counter anion, S represents a spacer containing a carbon atom and a hydrogen atom or a spacer directly connecting two terpyridine groups, R 1 to R 4 each independently represent a hydrogen atom or a substituent, and n is an integer of 2 or more indicating the degree of polymerization, wherein in the Formula, M 1 to M N (N is an integer of 2 or more) each independently represent a metal ion having different oxidation-reduction potentials, and X 1 to X n (n is an integer of 2 or more) each independently represent a counter anion, S 1 to S N (N is an integer of 2 or more) each independently represent a spacer containing a carbon atom and a hydrogen atom or a spacer directly connecting two terpyridine groups, R 1 1 to R 1 N, R 2 1 to R 2 N, R 3 1 to R 3 N, and R 4 1 to R 4 N (N is an integer of 2 or more) each independently represent a hydrogen atom or a substituent, and n 1 to n N are each independently an integer of 2 or more indicating the degree of polymerization, and wherein in the Formula, M represents a metal ion, X represents a counter anion, A represents a spacer containing a carbon atom and a hydrogen atom or a spacer directly connecting two phenanthroline groups, R 1 to R 4 each independently represent a hydrogen atom or a substituent, and n is an integer of 2 or more indicating the degree of polymerization.