Provided is a method for manufacturing an absorbent body (100) comprising synthetic fibers (10b). This method for manufacturing an absorbent body (100) includes: a delivery step of delivering a plurality of sheet pieces (10bh) comprising synthetic fibers (10b) to an accumulation recess (41) using a duct 3； an accumulation step of accumulating, in the accumulation recess (41), the plurality of sheet pieces (10bh) delivered in the delivery step to form an accumulation (100a') which is a constituent member of the absorbent body (100)； and a pressing step of pressing, in the thickness direction, the accumulation (100a') across the entirety thereof.本發明之吸收體(100)之製造方法係包含合成纖維(10b)之吸收體之製造方法。該吸收體(100)之製造方法具備：搬送步驟，其係使用管道(3)將包含合成纖維(10b)之複數片薄片(10bh)搬送至集聚用凹部(41)；集聚步驟，其係使上述搬送步驟中所搬送之複數片薄片(10bh)集聚於集聚用凹部(41)，而形成吸收體(100)之構成構件即集聚體(100a')；及加壓步驟，其係對集聚體(100a')遍及其整體於厚度方向上進行加壓。
