NOVELTY - The generator generates combustion gas containing oxygen gas and hydrogen gas. A spacer (4) is arranged alternating with electrodes of floating electrode group. The spacer is formed as opening portion for electrolysis reaction (5a). The opening (5b) for combustion gas collection is extended above the opening portion for electrolysis reaction whose periphery is formed in step shape. The electrode receiving claw portions (5c) are provided to engage electrode. The electrolyte solution filling portion (5) is formed to fill electrolyte solution.    USE - Combustion gas generator mounted in motor vehicle. Can also be used in boat and ship.    ADVANTAGE - The electrode of floating electrode group can be electrically charged and the number of electrical connection is reduced by arranging electrodes alternately so that the voltage applied to electrode is reduced and electrodes are utilized effectively while suppressing heat generation and corrosion of electrode. The combustion gas generator of the static induction system with compact structure can be provided, the combustion gas containing oxygen gas and hydrogen gas can be generated efficiently and the efficiency of combustion gas generation can be improved while ensuring energy saving property and installable property. The opening for combustion gas collection is extended above the opening portion for electrolysis reaction so that the combustion gas can be collected and discharged effectively. The electrodes can be held by predetermined spacing expediently and reliably so as to prevent generation of temperature rise or short and handleability, durability, operation certainty, and stability of the combustion gas generator can be improved.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the spacer of the combustion gas generator.    Spacer (4)    Electrolyte solution filling portion (5)    Opening portion for electrolysis reaction (5a)    Opening for combustion gas collection (5b)    Electrode receiving claw portion (5c)