Absorbent article manufacturing apparatus comprising: a web conveyor for conveying a web in a machine direction along a flow direction of steps for manufacturing absorbent articles, the web having a top surface on which workpieces are arranged at predetermined intervals, the web conveyor comprising: a belt conveyor that includes a region for adsorbing a bottom surface of the web, and conveys the web in the machine direction; and a holding conveyor that holds at least top surfaces of the workpieces, wherein: the belt conveyor has a length in the machine direction greater than a length of the holding conveyor in the machine direction, and extends downstream from an end portion of the holding conveyor at least at a downstream side; the holding conveyor has a width arranged at least within a width of the workpieces; and a boundary at which conveying conditions of the belt conveyor change exists between an upstream end portion and a downstream end portion of the holding conveyor the web conveyor is arranged in the absorbent article manufacturing apparatus, which is formed by combining a plurality of units (300, Uf, UR) provided with mechanisms to perform at least a portion of the steps for manufacturing the absorbent articles, in a manner to straddle a boundary between the units; the boundary between the units is located between the upstream end portion and the downstream end portion of the holding conveyor; characterized by internal pressure of a downstream unit is greater than internal pressure of an upstream unit (Uf). a belt conveyor that includes a region for adsorbing a bottom surface of the web, and conveys the web in the machine direction; and a holding conveyor that holds at least top surfaces of the workpieces, wherein: the belt conveyor has a length in the machine direction greater than a length of the holding conveyor in the machine direction, and extends downstream from an end portion of the holding conveyor at least at a downstream side; the holding conveyor has a width arranged at least within a width of the workpieces; and a boundary at which conveying conditions of the belt conveyor change exists between an upstream end portion and a downstream end portion of the holding conveyor the web conveyor is arranged in the absorbent article manufacturing apparatus, which is formed by combining a plurality of units (300, Uf, UR) provided with mechanisms to perform at least a portion of the steps for manufacturing the absorbent articles, in a manner to straddle a boundary between the units; the boundary between the units is located between the upstream end portion and the downstream end portion of the holding conveyor; characterized by internal pressure of a downstream unit is greater than internal pressure of an upstream unit (Uf). the belt conveyor has a length in the machine direction greater than a length of the holding conveyor in the machine direction, and extends downstream from an end portion of the holding conveyor at least at a downstream side; the holding conveyor has a width arranged at least within a width of the workpieces; and a boundary at which conveying conditions of the belt conveyor change exists between an upstream end portion and a downstream end portion of the holding conveyor the web conveyor is arranged in the absorbent article manufacturing apparatus, which is formed by combining a plurality of units (300, Uf, UR) provided with mechanisms to perform at least a portion of the steps for manufacturing the absorbent articles, in a manner to straddle a boundary between the units; the boundary between the units is located between the upstream end portion and the downstream end portion of the holding conveyor; characterized by internal pressure of a downstream unit is greater than internal pressure of an upstream unit (Uf).