A MANUFACTURING METHOD OF ABSORBENT ARTICLE (1) INCLUDES THE STEPS OF: BONDING FASTENER MEMBERS (11) TO EACH SIDE FLAP (10) BONDING THE SIDE FLAP (10) TO WHICH THE FASTENER MEMBERS (11) ARE BONDED TO A CORRESPONDING MAIN BODY SHEET (4) FOLDING THE SIDE FLAP (10) ALONG AN END PORTION OF THE MAIN BODY SHEET (4) IN A WIDTHWISE DIRECTION W AND INTEGRATING THE MAIN BODY SHEET (4) WITH THE SIDE FLAP (10) THUS FOLDED AND AN ABSORBER (3) TOGETHER. ACCORDING TO THIS, IT IS POSSIBLE TO HOLD SIDE FLAPS (10) STABLY IN A FOLDED STATE, INHIBITING FIXED PORTIONS (31) BETWEEN THE SIDE FLAPS (10) AND AN ABSORBENT MAIN BODY (2) FROM GETTING CREASED AND TWISTED, AND INHIBITING THE SIDE FLAPS (10) FROM GETTING DISPLACED. FIGURE 1