A manufacturing method of an absorbent article according to the present invention includes the steps of: splitting an elastic member bundle having line-splitting strength within the predetermined range into multiple first elastic members by feeding the elastic member bundle in an MD via a line splitter, the line-splitting strength measured by a predetermined measuring method; applying an adhesive at least on a predetermined curved line on a web continuously conveyed; and placing the multiple elastic members thus split on the web while swinging the elastic members in a CD. The elastic member bundle is formed by splitting a single original elastic member with a slit into the multiple elastic members, and bundling and pressurizing the multiple elastic members.