Method for manufacturing exhaust gas purification catalyst device

A method for manufacturing an exhaust gas purification catalyst device, the method comprising the steps of:

• (A) in a coating liquid placement station, holding a honeycomb substrate having a plurality of cell flow channels partitioned by cell walls so that a flow direction of the cell flow channels is vertical, and placing a catalyst layer formation coating liquid on an upper end surface of the substrate,
• (B) transporting the substrate after the coating liquid placement from the coating liquid placement station to a suction station;
• (C) in the suction station, suctioning the substrate after the coating liquid placement from a lower end surface, to coat one or both of on the cell walls and in the cell walls of the substrate with the coating liquid, and
• (D) removing the substrate after the coating liquid coating from the suction station and transporting it to a subsequent step,
• a time of the step (C) for suctioning the substrate from the lower end surface after the coating liquid placement being longer than a time of the step (A) for placing the catalyst layer formation coating liquid on the upper end surface of the substrate, wherein
• the suction station comprises two or more suction devices,
• the step (B) comprises:
• (B1) transporting the substrate after the coating liquid placement from the coating liquid placement station to a branching station, and
• (B2) transporting the substrate from the branching station to the suction station,
• wherein, in the step (B2), the substrate is transported to any vacant suction device of the two or more suction devices.