FUEL TREATMENT DEVICE

Disclosed is a fuel treatment device which comprises an inner cylinder, an intermediate cylinder, and an outer cylinder. The outer cylinder comprises: the lower part having small bore diameter; the upper part having a bore diameter larger than that of the lower part; and the intermediate part connecting the lower part with the upper part. The intermediate part and the lower part do not comprise an all-around welded part. The fuel treatment device comprises: a heating unit disposed within the inner cylinder; an evaporation unit formed between the upper part of the inner cylinder and that of the intermediate cylinder; a reformation unit formed between the lower part of the inner cylinder and that of the intermediate cylinder; and a carbon monoxide removal unit arranged between the upper part of the intermediate cylinder and that of the outer cylinder.