Rotational blade for shredder and shredder

The invention provides a rotational blade (3) for a shredder. The rotational blade comprises a stationary blade (6) having a mounting surface (6a) formed circumferentially and a shredding blade (22) mounted on the mounting surface (6a). The shredding blade (22) has a first shredding blade (8a) and a second shredding blade (8b). The first shredding blade (8a) and the second shredding blade (8b) are arranged along an axial direction of a rotation axis (2) into one row. The position of a first cutting edge portion of the first shredding blade (8a) is staggered from the position of a second cutting edge portion of the second shredding blade (8b) along the rotation direction (R) of the rotation axis (2). 本发明提供种粉碎机用的旋转刀(3)，其具备在周向上形成安装面(6a)的定刀台(6)、以及能够安装于所述安装面(6a)的粉碎刀(22)，其中，所述粉碎刀(22)具有第粉碎刀(8a)以及第二粉碎刀(8b)，所述第粉碎刀(8a)以及所述第二粉碎刀(8b)沿旋转轴(2)的轴向配置为列，所述第粉碎刀(8a)的第切削刃部的位置相对于所述第二粉碎刀(8b)的第二切削刃部的位置沿所述旋转轴(2)的旋转方向(R)错开。