To provide a hopper for preventing the clogging generated by a bridge, a crusher with the hopper and also a clogging prevention method for the hopper.

A constitution in which respective nozzles 28 applying the side pressure to sediments M in an introduction flow path 21 and jetting pressurized water W are formed on a side wall 24 of a hopper main body 22 is adopted for a hopper 20. Also the constitution having the hopper 20 is adopted for a crusher 19. For the clogging prevention method, a method of applying the side pressure to the sediments M in the hopper main body 22 and jetting the pressurized water W to crush the sediments is adopted.