To provide a cutter blade management device which determines exchange timing of a cutter blade without wasting material.

The cutter blade 30 management device 1 for preforming half-cutting on a sheet member, comprises: an imaging means 10 imaging the cutter blade 30; a cutting edge information obtaining means 21 obtaining the information about an cutting edge angle of the cutter blade 30 and the width of the cutting edge according to image information from the imaging means 10; an estimated remaining thickness calculating means 22 calculating an estimated value of the remaining thickness of a notch formed on the sheet member according to the information from the cutting edge information obtaining means 21; and a determining means 24 determining the exchange timing of the cutter blade 30 by comparing the estimated value (t) from the estimated remaining thickness calculating means 22 with a reference value R.