A machining device, in particular for machining workpieces made of wood, wood materials, plastic, with at least one workpiece table with a workpiece holder for holding at least one workpiece, and with a supply device for supplying at least one workpiece to the at least one workpiece table, wherein the at least one workpiece is positionable in three dimensions with respect to the at least one workpiece table, wherein one workpiece table or two or more workpiece tables is or are provided, and wherein the supply device is shiftable at least in one direction relative to the at least one workpiece table, wherein the supply device is shiftable in two directions (y direction, 12, z direction, 11) relative to the at least one workpiece table or to the workpiece tables, wherein the supply device is shiftable in both directions by means of two advancing units, wherein the respective workpiece table has a workpiece holder with a number of clamping elements which are arranged spaced apart from one another in the longitudinal direction of the respective workpiece table and a clamping element has two pairs of clamping jaws (18, 19) each with two clamping jaws, wherein in each case at least one of the clamping jaws of a pair is shiftable relative to the other clamping jaw of the pair, and wherein the clamping jaws (18, 19) of a first pair protrude in a first direction perpendicular to the longitudinal direction, wherein the clamping jaws of a second pair protrude in a direction opposed to the first direction perpendicular to the longitudinal direction, characterised in that the at least one workpiece table or at least one of the workpiece tables or each of the workpiece tables is shiftable at least in its longitudinal direction (x direction, 13) relative to the supply device, and wherein the respective workpiece table is shiftable in its longitudinal direction by means of an advancing unit. wherein the supply device is shiftable at least in one direction relative to the at least one workpiece table, wherein the supply device is shiftable in two directions (y direction, 12, z direction, 11) relative to the at least one workpiece table or to the workpiece tables, wherein the supply device is shiftable in both directions by means of two advancing units, wherein the respective workpiece table has a workpiece holder with a number of clamping elements which are arranged spaced apart from one another in the longitudinal direction of the respective workpiece table and a clamping element has two pairs of clamping jaws (18, 19) each with two clamping jaws, wherein in each case at least one of the clamping jaws of a pair is shiftable relative to the other clamping jaw of the pair, and wherein the clamping jaws (18, 19) of a first pair protrude in a first direction perpendicular to the longitudinal direction, wherein the clamping jaws of a second pair protrude in a direction opposed to the first direction perpendicular to the longitudinal direction, characterised in that the at least one workpiece table or at least one of the workpiece tables or each of the workpiece tables is shiftable at least in its longitudinal direction (x direction, 13) relative to the supply device, and wherein the respective workpiece table is shiftable in its longitudinal direction by means of an advancing unit.