Machine tool, having a base body (12, 116, 131, 152), with at least one plate member (16, 83, 114, 132, 170, 172 174, 176) arranged in a plate seat (18, 112, 134, 156, 158, 160, 162, 164, 168) on the base body (12, 116, 131, 152), wherein said plate element has at least one plate edge (38, 234, 236) protruding freely outwardly over the plate seat (18, 112, 134, 156, 158, 160, 162, 164, 168) and abutting against a bottom support surface (26, 128, 161) of the plate seat (18, 112, 134, 156, 158, 160, 162, 164, 168), and which can be fixed by means of a screw (20, 120, 129, 135, 178, 180, 182, 184) reaching through a bore (42, 105, 179, 181, 183, 185) in the plate member (16, 83, 114, 132, 170, 174, 176) to the insert seat (18, 112, 134, 156, 158, 160, 162, 164, 168), in which, for the plate member (16, 83, 114, 132, 170, 172, 174, 176) on the plate seat (18, 112, 134, 156, 158, 160, 162, 164, 168), at least one adjustable abutment (22, 61, 88, 122, 136, 186, 188, 190, 192) is provided which has a bearing surface (34, 69, 96, 98, 193) on which the plate member (16, 83, 114, 132, 170, 172, 174, 176) frictionally rests with a lateral plate surface (40, 89, 100), and which has a flat outer portion surface and a curved outer portion surface, wherein the adjustable abutment (22, 61, 88, 122, 136, 186, 188, 190, 192) is guided in a linear guide (50, 111, 202, 206, 210, 240), which has a circular arcuate guide portion and a guide surface designed as a flat portion (57, 59), in which, on the plate seat (18, 112, 134, 156, 158, 160, 162, 164, 168) a further adjustable abutment (24, 90, 124, 138, 194, 196, 198, 200) having a bearing surface (36, 98, 201) for the frictional abutment a lateral plate surface of the plate member (16, 83, 114, 132, 170, 172, 174, 176) is formed, wherein for setting of the plate edge (38, 234, 236) of the plate member (16, 83, 114, 132, 170, 172, 174, 176) an adjusting device (30, 230, 232) is associated with the adjustable abutment (22, 61, 88, 122, 136, 186, 188, 190, 192), wherein the adjusting device, which, with respect to the bottom support surface (26, 128, 161) of the plate seat (18, 112, 134, 156, 158, 160, 162, 164, 168), allows a raising and lowering of this abutment (22, 61, 88, 122, 136, 186, 188, 190, 192), and wherein the curved outer portion surface of the adjustable abutment (22, 61, 88, 122, 136, 186, 188, 190, 192) is located with little play on the arcuate curved guide portion and the planar outer section surface of the adjustable abutment (22, 61, 88, 122, 136, 186, 188, 190, 192) lies on the guide surface (57, 59) of the linear guide (50, 111, 202, 206, 210, 240) configured as a flat surface, in order to compensate the forces and moments occurring on this abutment (22, 61, 88, 122, 136, 186, 188, 190, 192) during the setting of the plate member (16, 83, 114, 132, 170, 172, 174, 176) and to introduce them into the base body (12, 116, 131, 152), characterized in that the bearing surface of the adjustable abutment (22, 61, 88, 122, 136, 186, 188, 190, 192) or the lateral plate surface of the plate member (16, 83, 114, 132, 170, 172, 174, 176) is convexly curved in a plane parallel to the bottom support surface (26, 128, 161) of the plate seat (18, 112, 134, 156, 158, 160, 162, 164, 168) or is prismatically curved in the form of surface portions juxtaposed in a segment shaped manner.