To provide an anew improved rock drill and rock crusher.

The rock crusher includes a first controller 8 disposed to a transfer body 1 and a second controller 9 disposed to the rock drill 4. The first controller 8 and the second controller 9 mutually communicate by a first data communication link 10. The drill 4 has one or more of sensors 11, 12 and 15, and the result of a measurement is processed by the second controller 9, and only transferred to the first controller 8 in the drill 4. The second controller contains the sensors 11, 12 and 15 and the controller 9 controlling the operation of the drill 4.