The object of the present invention is to provide a manufacturing method of an absorbent article capable of reliably detecting whether or not a failure has occurred in a bonded state of a predetermined region corresponding to a bonded region of a front waistband region and a rear waistband region. The manufacturing method of an absorbent article according to the present invention includes: a step A of bonding, by using an ultrasonic bonding device 100, a continuum of a front waistband region 20A and a continuum of a rear waistband region 20B in predetermined regions 40A of the continuum 10 each corresponding to a bonded region 40 of the front waistband region 20A and the rear waistband region 20B after overlapping the continuum of the front waistband region 20A and the continuum of the rear waistband region 20B under conveyance a step B of outputting a first predetermined signal indicating a failure state when it is determined that an output signal from the ultrasonic bonding device 100 does not satisfy a first specified condition and a step C of outputting a second predetermined signal indicating a failure state when it is determined that a bonded area in any of the predetermined regions does not satisfy a second specified condition.
