PROBLEM TO BE SOLVED: To provide a blade automatic replacement device which can solve fundamentally the conventional problem because no damage is caused on a blade surface or a flange end surface when a blade is attached or detached to or from a spindle.SOLUTION: In a blade automatic replacement device 20 for automatically replacing a blade 14 of round-blade shape attached to a spindle 10, a blade attaching and detaching mechanism part 22 which attaches and detaches the blade 14 for a flange member 12, the blade 14 being attached freely attachably and detachably to the spindle 10 by sandwiching blade both surfaces configured by inserting a blade center hole through a blade insertion part 12B of the flange member 12 for blade attachment which is provided on a shaft tip part of the spindle 10 with a blade holding surface 12C of the flange member 12 and a nut member 18 to be screwed to the blade insertion part 12B, includes a clamp means 40 which grips the blade 14, a nut rotation means 42 which rotates the nut member 18 and an advancing and retreating means 44 which advances and retreats the clamp means 40 and the nut rotation means 42 for the spindle 10.SELECTED DRAWING: Figure 4
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