To provide a deburring device capable of coping with workpieces W of various sizes and securing stable deburring accuracy in a short cycle time.

A fixed shaft 6 is disposed to extend along the axis of the workpiece W, and a first deburring member 10 is fitted to the outer periphery of the fixed shaft 6 rotatably and movably in the axial direction. A second deburring member 20 is fitted to the outer periphery of a first shaft part 11 of the first deburring member 10 rotatably and movably in the axial direction. Energizing means 33 are provided between the first shaft part 11 and a second shaft part 21 to energize a first disk part 12 of the first deburring member 10 and a second disk part 22 of the second deburring member 20 in a mutually approaching direction, while an opening/closing pin 42 is inserted between the first disk part 12 and the second disk part 22 so that a clearance X between the first disk part 12 and the second disk part 22 can be enlarged to a longer distance X2 from a distance X1 shorter than the axial distance Y of the workpiece W.