PROBLEM TO BE SOLVED: To provide an electrolytic light-emitting device which can be applied to the production of hydrogen usable as an energy source; a hydrogen-gas-generating apparatus using the electrolytic light-emitting device; a method for generating hydrogen using the device; a power generator using hydrogen obtained by the apparatus; and a method for generating a power using the apparatus. SOLUTION: The electrolytic light-emitting device comprises: a reaction vessel 1 of an electrolytic tank; an electrolytic solution 4 retained in the reaction vessel 1; a platinum anode 5 and the tip of a cathode terminal 2, which are placed so as to contact with the electrolytic solution 4 and contain a refractory metal; and a power source 18 and a control unit 17, which are electrolytic light-emitting reaction means. The electrolytic solution 4 contains 0.05 mol/liter or higher of an alkali metal carbonate as an electrolyte. The platinum anode 5 has a 10 times or larger surface area than the tip of the cathode terminal 2 has. The power source 18 and the control unit 17 cause an electrolytic luminescence reaction between the tip of the cathode terminal 2 and the platinum anode 5, through applying a voltage of 100 V or higher between them. COPYRIGHT: (C)2006,JPO&NCIPI