An exhaust gas treatment apparatus comprising: a sealed vessel in which exhaust gas is introduced and treated; a partition which vertically divides an inside of the sealed vessel; an absorbing liquid storage portion which is provided under the partition of the sealed vessel and stores an absorbing liquid for desulfurization absorbing sulfur oxides from exhaust gas; an exhaust gas introducing portion which is provided above the partition of the sealed vessel and introduces exhaust gas from outside of the sealed vessel; a plurality of sparger pipes which is in communication with the exhaust gas introducing portion and extends inside the absorbing liquid stored in the absorbing liquid storage portion on the lower side from the partition to jet and disperse exhaust gas into the absorbing liquid in a liquid layer from the exhaust gas introducing portion and, thus, to form a froth layer on the liquid layer of the absorbing liquid; and a gas riser which is in communication with an upper space above the absorbing liquid in the absorbing liquid storage portion, extends upward from the partition, and passes through the exhaust gas introducing portion, with twenty or less gas risers being preferably provided, characterized in that a region of the partition except for a gas riser installation region of the partition is an effective region, in which the gas riser is not provided and in which the sparger pipes can be arranged, and includes a jet region where the sparger pipes are arranged at an interval within a predetermined range so that exhaust gas is ejected into the absorbing liquid and a plurality of non-jet regions where the sparger pipes are not arranged at an interval wider than the interval within the predetermined range so that exhaust gas is not ejected into the absorbing liquid so that the absorbing liquid in the froth layer moves down to the liquid layer side, with the plurality of the non-jet regions being dispersively provided in the effective region of the partition. a sealed vessel in which exhaust gas is introduced and treated; a partition which vertically divides an inside of the sealed vessel; an absorbing liquid storage portion which is provided under the partition of the sealed vessel and stores an absorbing liquid for desulfurization absorbing sulfur oxides from exhaust gas; an exhaust gas introducing portion which is provided above the partition of the sealed vessel and introduces exhaust gas from outside of the sealed vessel; a plurality of sparger pipes which is in communication with the exhaust gas introducing portion and extends inside the absorbing liquid stored in the absorbing liquid storage portion on the lower side from the partition to jet and disperse exhaust gas into the absorbing liquid in a liquid layer from the exhaust gas introducing portion and, thus, to form a froth layer on the liquid layer of the absorbing liquid; and a gas riser which is in communication with an upper space above the absorbing liquid in the absorbing liquid storage portion, extends upward from the partition, and passes through the exhaust gas introducing portion, with twenty or less gas risers being preferably provided, characterized in that a region of the partition except for a gas riser installation region of the partition is an effective region, in which the gas riser is not provided and in which the sparger pipes can be arranged, and includes a jet region where the sparger pipes are arranged at an interval within a predetermined range so that exhaust gas is ejected into the absorbing liquid and a plurality of non-jet regions where the sparger pipes are not arranged at an interval wider than the interval within the predetermined range so that exhaust gas is not ejected into the absorbing liquid so that the absorbing liquid in the froth layer moves down to the liquid layer side, with the plurality of the non-jet regions being dispersively provided in the effective region of the partition.