Provided are blades (5) which extend in the direction of the diameter of a rotor (4) in a pulper (1), said blades being characterized in that each is formed from a base part (51) wherein the front side in the direction of rotation is formed into a ridge, and an L-shaped blade body (521) and plate blade body (522) which are formed by dividing a substantially U-shaped groove (52) that engages with the base part (51) into two along the longitudinal direction, with the L-shaped blade body (521) being positioned on the rotor (4) upper surface side and the plate blade body (522) being positioned on the rotor (4) bottom surface side, and the L-shaped blade body (521) and the plate blade body (522) are attachable to, as well as detachable, from the base part (51)by bolts B that provide threaded engagement from the rotor (4) upper surface side through holes (511) passing through the ridge of the base part (51).
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