To provide a cutter pin fall-out preventive structure in which backlash generated by impact between a pin and a cutter holder is small and the fitting and the replacement of a cutter is made easy in a crushing roll.

A groove 15c is provided on the outer periphery of a pin 15, and also holes 15a, 15b are provided in the axial direction and in the radial direction respectively so as to lead to the groove 15c from the end part of the pin 15. On the inner periphery of a pin hole 8b of a cutter holder 8, a groove 8c opposite to the groove 15c on the outer periphery of the pin 15. A clearance is formed by the groove 15c provided on the outer periphery of the pin 15 through the holes 15a, 15b from the end part of the pin 15 and the groove 8c provided on the inner periphery of the pin hole 8b of the cutter holder 8. A powdery or liquid solidifying agent is caused to flow into the clearance to solidify it.