A drilling support for a rock perforator, of the type comprising: a jib on a boring support carrier; a drilling carriage pivotally arranged above the jib; a rock-perforator power-tool slidably arranged on the drilling carriage; a first power drive connected to the boring support carrier for lifting and lowering the drilling carriage and an additional power drive pivotally connected with the drilling carriage for positioning the drilling carriage. The provision of the additional power drive enables a simple non-telescopic construction to be adapted for the jib, at the same time providing the required maneuverability of the drilling carriage.
