and a flushing mechanism 14 and the rock drill 10 is movable forward and backward by a feed mechanism 12 provided in the guide shell 11 the drilling of rock is performed by transmitting a striking force and a rotating force to the bit 6 through the shank rod 3 and rod 4 from the striking mechanism 13 and the rotating mechanism 9 furthermore the flushing mechanism 14 supplies compressed air to the end of the rod 4 to discharge dust produced by the drilling a dust pot 36 is attached to the front end of the guide shell 11 to cover a drilling hole end and the dust pot 36 is connected to a dust collector not shown to collect the discharged dust when the length of a hole to be drilled is longer than the length of the rod 4 since it is necessary to add a rod to the rod 4 and to recover the rod the guide shell 11 is provided with a rod exchange device 17 for adding and recovering the rod on the running truck 5 as shown in fig1 there are mounted with a hydraulic driving section 15 for driving the impacting mechanism 13 the rotating mechanism 9 the feed mechanism 12 and the rod exchange device 17 and an air driving section 16 for supplying the compressed air to the flushing mechanism 14 furthermore as detecting means 18 for detecting the striking force rotating pressure feed length speed and flushing pressure there are provided in the hydraulic droving section 15 with an impacting force detector 19 a rotational pressure detector 20 a feed length detector 21 a feed pressure detector 22 and moreover a flushing pressure detector 23 is.