NOVELTY - The apparatus has gas generation unit (8) that generates hydrogen gas from electrolyte solution using electromotive force while electrically connecting with back surface of photoelectric conversion unit (2). Gas generation unit (7) generates oxygen gas from electrolyte solution using electromotive force while connecting with light-receiving surface of photoelectric conversion unit. Gas passage (17) is provided between back surface of photoelectric conversion unit and gas generation units. Hydrogen gas or oxygen gas is conveyed to gas discharge port by gas passage.    USE - Apparatus for manufacturing gas e.g. hydrogen and oxygen used as dispersion-type fuel in home and factory.    ADVANTAGE - Since the hydrogen gas or oxygen gas is conveyed to gas discharge port by gas passage, the gas can be collected rapidly from the gas discharge port, so that the gas retaining in the surface of the gas generation units can be suppressed efficiently. Hence the additional equipment for vibrating the apparatus for circulating the electrolytic solution can be avoided and the size of the gas manufacturing apparatus can be reduced. The gas manufacturing apparatus with the high gas generation efficiency can be obtained at low cost. Since the gas electrical connection unit can separate the photoelectric conversion unit and electrolyte solution, the photoelectric conversion unit can be prevented from contacting with the electrolytic solution. Hence the photoelectric conversion unit can be prevented from corrosion and decline in the photoelectric conversion efficiency due to inflow of electrolytic solution to the photoelectric conversion unit can be prevented.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for gas manufacturing method.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view illustrating the gas manufacturing apparatus.    Translucent substrate (1)    Photoelectric conversion unit (2)    Gas generation units (7,8)    Outer case (16)    Gas passage (17)