Mining machine for driving tunnels, galleries or the like, said mining machine including: - a rotational cutting head having a plurality of rock engaging cutting elements distributed on its periphery, - a rotator for rotationally driving said cutting head, - said cutting head having a rotation axis extending essentially vertically, when the mining machine is aligned on horizontal ground, - a positioning arrangement arranged to position the cutting head between cuts, said positioning arrangement being arranged to swing the cutting head horizontally from a first side to a second side to reach first side and second side positions respectively, - means for forcing the cutting head against rock to be worked so as to disintegrate the rock, and - means (7,7') for transporting away released material, characterized in - that the cutting head on an upper side is attached to a one-sided support unit such that the lower side of the cutting head is free from support means, - that the mining machine includes a pressing unit arranged to press the cutting head linearly against rock to be worked, essentially in a longitudinal direction of the mining machine when aligned, and - that the rotator is arranged to rotate the cutting head in a first rotational direction during a cut where the cutting head is in a first side position and that the rotator is arranged to rotate the cutting head in a second rotational direction in a cut where the cutting head is in a second side position so that disintegrated rock material is forced by the cutting head from the respective side to which the cutting head is swung to a more central part of an excavation site. - a rotational cutting head having a plurality of rock engaging cutting elements distributed on its periphery, - a rotator for rotationally driving said cutting head, - said cutting head having a rotation axis extending essentially vertically, when the mining machine is aligned on horizontal ground, - a positioning arrangement arranged to position the cutting head between cuts, said positioning arrangement being arranged to swing the cutting head horizontally from a first side to a second side to reach first side and second side positions respectively, - means for forcing the cutting head against rock to be worked so as to disintegrate the rock, and - means (7,7') for transporting away released material, characterized in - that the cutting head on an upper side is attached to a one-sided support unit such that the lower side of the cutting head is free from support means, - that the mining machine includes a pressing unit arranged to press the cutting head linearly against rock to be worked, essentially in a longitudinal direction of the mining machine when aligned, and - that the rotator is arranged to rotate the cutting head in a first rotational direction during a cut where the cutting head is in a first side position and that the rotator is arranged to rotate the cutting head in a second rotational direction in a cut where the cutting head is in a second side position so that disintegrated rock material is forced by the cutting head from the respective side to which the cutting head is swung to a more central part of an excavation site.