Pedicle screw having a screw shaft and a screw head connected thereto, said screw head having a central longitudinal axis extending in one direction, the X direction, having the following further design: - the screw head has a head base on its lower end facing the screw shaft, on which head base two wall sections extending away from the screw shaft in the X direction are moulded, said wall sections laterally delimiting a recess which runs in a Y direction extending perpendicularly to the X direction and opens in the head upper side for receiving a connecting rod having a circular cross-sectional shape, - the screw shaft protrudes into the head base via a bottom opening in the head base connected to the recess with a joint head and is stored therein in such a way that the screw head is able to be pivoted with respect to the screw shaft about a single head pivot axis running parallel to the Y direction, - a fixing screw serving to fix the connecting rod in the screw head is present in the recess, said fixing screw engaging with an inner thread present on the inner side of the wall sections with an outer thread, - in the recess, a clamping device is held in the screw head between the fixing screw and the head base to be pivotable about a pivot axis, said clamping device extending in a Z direction which runs perpendicularly to the Y and X directions and being arranged above the head pivot axis with spacing in the X direction, - the clamping device has a hollow space, which is penetrated by the connecting rod in the assembled state, as well as a lower spherical surface facing the head base, the sphere centre of which rests against the pivot axis of the clamping device, - the clamping device is applied with a force directed towards the head base by the fixing screw in the assembled state, characterised in that an intermediate element is present in the head base, said intermediate element having a counter spherical surface on its side facing the clamping device which interacts with the lower spherical surface of the clamping device and having a cylindrical surface on its side facing the screw shaft, said cylindrical surface interacting with a counter cylindrical surface which is present on the joint head, wherein the cylindrical surfaces have a common axis of curvature which coincides with the pivot axis of the screw head and wherein the joint head and the head base are connected to each other by a bayonet catch. - the screw head has a head base on its lower end facing the screw shaft, on which head base two wall sections extending away from the screw shaft in the X direction are moulded, said wall sections laterally delimiting a recess which runs in a Y direction extending perpendicularly to the X direction and opens in the head upper side for receiving a connecting rod having a circular cross-sectional shape, - the screw shaft protrudes into the head base via a bottom opening in the head base connected to the recess with a joint head and is stored therein in such a way that the screw head is able to be pivoted with respect to the screw shaft about a single head pivot axis running parallel to the Y direction, - a fixing screw serving to fix the connecting rod in the screw head is present in the recess, said fixing screw engaging with an inner thread present on the inner side of the wall sections with an outer thread, - in the recess, a clamping device is held in the screw head between the fixing screw and the head base to be pivotable about a pivot axis, said clamping device extending in a Z direction which runs perpendicularly to the Y and X directions and being arranged above the head pivot axis with spacing in the X direction, - the clamping device has a hollow space, which is penetrated by the connecting rod in the assembled state, as well as a lower spherical surface facing the head base, the sphere centre of which rests against the pivot axis of the clamping device, - the clamping device is applied with a force directed towards the head base by the fixing screw in the assembled state,