A method of manufacturing an absorptive article includes a step of conveying in the conveying direction (MD) a second web (7B) comprising a series of parts each constituting a portion of the absorptive article (1), a step of swinging at a predetermined cycle an elastic member (6’) in the intersecting direction (CD) using a swing guide mechanism (120) for guiding the elastic member (6’), and a step of pressing by means of a pair of pressing rollers the second web (7B) to which the elastic member (6’) is provided. The swing guide mechanism (120) is provided with a motor (210) having a rotating shaft (211), an arm member (220) for guiding on the second web (7B) the elastic member (6') to a predetermined position in the intersecting direction (CD), and a reduction gear (230) provided between the rotating shaft (211) and the base end (221) of the arm member (220) and reducing the rotational speed (V
