To easily attach/detach a hammer of a hammer crusher quickly even if a hammer supporting shaft is not drawn out deliberately.

This hammer crusher is constituted so that the object to be crushed is hit and crushed by hammers 10 which are arranged on a rotatable rotor 5, projecting in the radial direction and supported by hammer supporting shafts 12 arranged in parallel to the rotary shaft. A fitting hole 14 through which the shaft 12 is inserted is arranged on each hammer 10. Each hammer 10 is divided into a hammer main body 20 and a detaching attachment 21 which are abutted against each other on the divided surface 22 formed across the hole 14 and can be attached to/detached from each other.