Manufacturing method of plugged honeycomb structure

Disclosed is a method for quickly and correctly manufacturing a honeycomb structure constituted of two types of cells including large cells each having a relatively large area of a section thereof vertical to a longitudinal direction and small cells each having a relatively small area of the section. The method is a manufacturing method of a honeycomb structure including a large number of cells arranged via partition walls, the cells being constituted of two types of cells including large cells each having a relatively large area of a section thereof vertical to a longitudinal direction and small cells each having a relatively small area of the section, the large cells being plugged in one end face of the honeycomb structure and the small cells being plugged in the other end face of the honeycomb structure. The method horizontally holds the honeycomb structure before the plugging along the longitudinal direction of the cells, first plugs the large cells, and continuously plugs the small cells.