To provide a rock bit apparatus with a striking mechanism, which has a compressed air feeding line and a second fluid pressure feeding line.

The rock bit apparatus with the striking mechanism has arranged therein the compressed air feeding line and the second fluid pressure feeding line for driving a down-the-hole drill body, independently from each other. The down-the-hole drill main body has a check valve arranged across an exhaust passage thereof. When the bit is advanced by the down-the-hole body, the compressed air is fed from the compressed air feeding line, and at the same time the second fluid pressure is auxiliarily fed from the second fluid pressure feeding line, followed by converging both the pressures at lower ends thereof to discharge slime. When the bit is advanced by rotating a casing without driving the down-the-hole drill body, the second fluid pressure is ejected from the second fluid pressure feeding line to discharge slime.

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