NOVELTY - A flat-type hydrogen generating device comprises a titania photoanode; anode electrolyte in which the titania photoanode is immersed; cathode including a titania photoanode material to which enzyme capable of reducing protons to hydrogen is immobilized; cathode electrolyte in which the cathode is immersed; nano-filtration membrane connecting the anode electrolyte and cathode electrolyte to each other; and solar cell (5) to be exposed to light, which connects the titania photoanode and cathode to each other via a conductive wire (6).    USE - A flat-type hydrogen generating device.    ADVANTAGE - The flat-type hydrogen generating device can more efficiently generate hydrogen by using sunlight; makes it possible to continuously generate hydrogen from water or aqueous solution by using sunlight due to its flat-type structure; and solves the low efficiency of conventional water-splitting hydrogen generating device using photocatalyst alone, and the complexity of an electron transfer system of enzyme.    DETAILED DESCRIPTION - A flat-type hydrogen generating device comprises:    (1) titania photoanode including a metal titanium support on which photocatalyst titania in a form of a tube is laminated by anodic oxidation, where titania photoanode is formed to be exposed to light;    (2) anode electrolyte in which the titania photoanode is immersed;    (3) cathode including a titania photoanode material to which enzyme capable of reducing protons to hydrogen is immobilized, where cathode is formed to be not exposed to light;    (4) cathode electrolyte in which the cathode is immersed;    (5) nano-filtration membrane connecting the anode electrolyte and cathode electrolyte to each other; and    (6) solar cell (5) to be exposed to light, which connects the titania photoanode and cathode to each other via a conductive wire (6).    DESCRIPTION OF DRAWING(S) - The drawing shows an external structure of a flat-type water-splitting hydrogen generation device.    Solar cell (5)    Conductive wire (6)    Oxygen outlet (13)    Hydrogen outlet (14)    Gasket (15)