An absorbent body production method comprising a crushing step of crushing the leading end of a pulp sheet (1) to form fibrous pulp which is a material for an absorbent body, a cutting step of cutting a preceding pulp sheet (1p) and a following pulp sheet (1f), and a joining step of joining the preceding pulp sheet (1p) and the following pulp sheet (1f) to provide a seamed pulp sheet, wherein the preceding pulp sheet (1p) and the following pulp sheet (1f) of the seamed pulp sheet are crushed in that order. This absorbent body production method is characterized by comprising: a cutting step that obliquely cuts the preceding pulp sheet (1p) and the following pulp sheet (1f) so as to form the same slope and so that the length (La) of the oblique cut line in the feeding direction is greater than the minimum distance (Lb) from a support position (20a) to the motion trajectory of the cutting edge of a crushing blade (31b)； and a joining step that provides the seamed pulp sheet by joining the sheets in a state in which a rear end cut line (CLp) and a leading end cut line (CLf) abut.吸收體製造方法係具備：將紙漿薄片(1)的前端粉碎而生成作為吸收體的材料之纖維狀紙漿之粉碎製程、將先行紙漿薄片(1p)和後進紙漿薄片(1f)切斷之切斷製程、及將先行紙漿薄片(1p)和後進紙漿薄片(1f)接合而生成具有接合處的紙漿薄片之接合製程，將具有接合處的紙漿薄片依先行紙漿薄片(1p)、後進紙漿薄片(1f)的順序進行粉碎，其特徵在於，係具備切斷製程及接合製程，切斷製程，是將先行紙漿薄片(1p)和後進紙漿薄片(1f)以傾斜程度成為相同的方式進行傾斜切斷，且以進給方向上之傾斜切斷線的長度(La)比從支承位置(20a)到粉碎刀(31b)之刀刃的移動軌跡之最短距離(Lb)更長的方式進行切斷；接合製程，是在讓後端部切斷線(CLp)和前端部切斷線(CLf)對接的狀態下進行接合，而生成具有接合處的紙漿薄片。
