To provide a sheet body cutting device capable of easily, accurately and repeatedly cutting a wound pressure sensitive adhesive tape many times in the optional desired length.

This sheet body cutting device 90 includes a holder part 92 for rotatably holding the wound tape (a sheet body) 91, a cutting blade 93 separately arranged from the holder part 92 in the extending direction of the tape 91, and a measuring tape (a measuring part) 96 arranging length measuring graduations 95 in one direction on a surface and movably arranging the tip side by going over the cutting blade 93 from the holder part 92 side along the extending direction of the tape 91.