Ultrasonic cutting device

The invention provides an ultrasonic cutting device which excites ultrasonic vibration to a cutting piece and does not worry about damage even if a large mechanical load is applied to the cutting piece. An ultrasonic cutting device is provided with a rotating shaft (1), a cylindrical flange (3) detachably attached to the rotating shaft (1), a disc-shaped cutter (5) extending radially outward from the cylindrical flange (3), and an annular piezoelectric element (7) detachably attached to the rotating shaft (1). The inner diameter of the piezoelectric element (7) is equal to or greater than the diameter of the rotating shaft (1), the cylindrical flange (3) and the disc-shaped cutter (5) are an integral structure, the disc-shaped cutter (5) has a solid structure without a gap, and the piezoelectric element (7) is located at a position separated from the disc-shaped cutter (5). 提供一种即使向切削件施加大的机械负载也不担心破损的对切削件激发超声波振动的超声波切削装置。超声波切削装置具备旋转轴(1)、能够装卸地安装于旋转轴(1)的圆筒法兰(3)、从圆筒法兰(3)向径向外侧扩展的圆盘状切削件(5)以及能够装卸地安装于旋转轴(1)的环状的压电元件(7)。