To provide a gas treatment apparatus which prevents clogging of microorganism carrier, etc. and effectively removes a gas to be treated containing a S-containing compound.

The gas treatment apparatus removes the S-containing compound from the gas to be treated containing the S-containing compound, wherein the gas treatment apparatus has a treatment tower for making the gas to be treated flow, and has, in the tower, a microorganism carrier for making a contact with the gas to be treated, a water-spraying part for spraying water from the upper part towards the microorganism carrier, an impregnation means for impregnating the microorganism carrier with a washing liquid and a blowing part for blowing from the lower part towards the microorganism carrier.

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