A fluorine gas generator is provided with which the gases used and/or generated, in case of leakage thereof, can be prevented from mixing together as far as possible and, even in case of gas leakage into the outside of the generator system, the leakage gas can be treated safely and in which the maintenance, exchange and other operations are easy to carry out. The generator comprises a box-shaped body containing an electrolyzer for fluorine gas generation, and the box-shaped body is divided into two or more compartments, including a compartment containing the electrolyzer.