Abstract: A solid-gas contact reactor for dirty exhaust gas is characterized by a first dust-proof plate provided on contact areas between a lower surface of a support base for supporting packages of catalyst layers in each stage and a reactor wall so that the first dust-proof plate makes an angle equal to or larger than the rest angle of dust in the exhaust gas with respect to the support base. Second dust-proof plates are provided on contact areas between adjacent ones of the packages of catalyst layers in each stage and contact areas between the reactor wall and frames of the packages of catalyst layers and the second dust-proof plates make the same angle with respect to the frame structure.