A vaporizer of the gas engine is provided to change a evaporation capacity while securing durability and correspond to the other demand amount of evaporated gas. A vaporizer of the gas engine includes a part forming warm water rooms(23,33) consisting of the separate part; partition plates(91,92) in which the part forming the fuel space(43) is partitioned are placed in interval and one set is overlapped; a body is comprised the part which is each parts(2,5,3,4) is fixed with a plurality of through bolts(10A) as the fixing means to laminating state with the connection. The heat-exchange surface is changed by changing the combination number of the fuel space and warm water room.
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