An absorbent article manufacturing apparatus comprising: a first conveying route that is arranged in a straight line along a first direction in plan view; a plurality of processing devices that process an intermediate product (lm) of an absorbent article that is conveyed along the first conveying route; a heating unit that restores bulk of a non-woven fabric through heating the non-woven fabric by blowing hot air onto the non-woven fabric while conveying the non-woven fabric along a direction in which the non-woven fabric is continuous, the non-woven fabric being a strip shape and serving as a part of the absorbent article; and a second conveying route (R31Yd) that conveys the non-woven fabric in a second direction that intersects the first direction in plan view, the non-woven fabric having been restored of the bulk through heating with the heating unit, the non-woven fabric being input to the first conveying route via the second conveying route; wherein the heating unit has a case member equipped with an entrance (62ain, 62bin) for the non-woven fabric and an exit (62aout, 62bout) for the non-woven fabric, one of an entrance-side portion (63wa, 63wb) and an exit-side portion of the case member has a blast opening (63Na, 63Nb) that blasts the hot air into a space inside the case member toward another one of the entrance-side portion and the exit-side portion, and the other one of the entrance-side portion and the exit-side portion has a discharge port (62aout, 62bout) that discharges, from the case member, the hot air that has flowed while being in contact with one surface of both surfaces of the non-woven fabric. a first conveying route that is arranged in a straight line along a first direction in plan view; a plurality of processing devices that process an intermediate product (lm) of an absorbent article that is conveyed along the first conveying route; a heating unit that restores bulk of a non-woven fabric through heating the non-woven fabric by blowing hot air onto the non-woven fabric while conveying the non-woven fabric along a direction in which the non-woven fabric is continuous, the non-woven fabric being a strip shape and serving as a part of the absorbent article; and a second conveying route (R31Yd) that conveys the non-woven fabric in a second direction that intersects the first direction in plan view, the non-woven fabric having been restored of the bulk through heating with the heating unit, the non-woven fabric being input to the first conveying route via the second conveying route; wherein the heating unit has a case member equipped with an entrance (62ain, 62bin) for the non-woven fabric and an exit (62aout, 62bout) for the non-woven fabric, one of an entrance-side portion (63wa, 63wb) and an exit-side portion of the case member has a blast opening (63Na, 63Nb) that blasts the hot air into a space inside the case member toward another one of the entrance-side portion and the exit-side portion, and the other one of the entrance-side portion and the exit-side portion has a discharge port (62aout, 62bout) that discharges, from the case member, the hot air that has flowed while being in contact with one surface of both surfaces of the non-woven fabric.