Workpiece support for mitre saw, suitable for rotatably mounting it on a saw stand and for co-rotating fastening thereto a saw unit having a saw blade lowerable from a position above the workpiece support, displaceable or not displaceable transversely, the workpiece support comprising: a circular disc-shaped turntable being penetrated by a saw blade slot serving as a passage for the saw blade lowered into the working position and having on one side a holder for fastening the sawing unit, a radial arm (1, 1a) extending the rotary plate and the saw blade slot radially outwards on a side opposite the holder in a longitudinal direction of the saw blade slot, wherein a radial arm connection (3, 3a) is provided, on which the radial arm (1, 1a) is attached detachably and co-rotatably to the workpiece support or on which a radially outer radial arm outer portion of the radial arm (1, 1a) is detachably and co-rotatably attached to a radially inner radial arm inner portion of the radial arm (1, 1a) integrally formed with the rotary plate, wherein a locking device (4, 4a) is provided in order to detachably lock the radial arm connection (3, 3a), which locking device (4, 4a) has a transverse bolt to be pushed into a bolt receptacle in a direction transverse to the saw blade slot, characterized in that the radial arm connection (3, 3a) is formed as a dovetail connection of the radial arm with the workpiece support or of the radial arm outer portion with the radial arm inner portion, wherein the radial arm connection (3, 3a) has on both sides of the saw blade slot one insertion pin projecting radially inwards from the radial arm or from the radial arm outer portion and formed as a dovetail projection and an associated insertion receptacle formed as a dovetail receptacle on the workpiece support or the radial arm inner portion, and wherein the bolt receptacle reaches through a side wall located in a direction transverse to the saw blade slot as far as to one of the two inserted insertion pins and through one of the inserted insertion pins, such that the saw blade slot arranged laterally adjacent thereto remains free. a circular disc-shaped turntable being penetrated by a saw blade slot serving as a passage for the saw blade lowered into the working position and having on one side a holder for fastening the sawing unit, a radial arm (1, 1a) extending the rotary plate and the saw blade slot radially outwards on a side opposite the holder in a longitudinal direction of the saw blade slot, wherein a radial arm connection (3, 3a) is provided, on which the radial arm (1, 1a) is attached detachably and co-rotatably to the workpiece support or on which a radially outer radial arm outer portion of the radial arm (1, 1a) is detachably and co-rotatably attached to a radially inner radial arm inner portion of the radial arm (1, 1a) integrally formed with the rotary plate, wherein a locking device (4, 4a) is provided in order to detachably lock the radial arm connection (3, 3a), which locking device (4, 4a) has a transverse bolt to be pushed into a bolt receptacle in a direction transverse to the saw blade slot, characterized in that the radial arm connection (3, 3a) is formed as a dovetail connection of the radial arm with the workpiece support or of the radial arm outer portion with the radial arm inner portion, wherein the radial arm connection (3, 3a) has on both sides of the saw blade slot one insertion pin projecting radially inwards from the radial arm or from the radial arm outer portion and formed as a dovetail projection and an associated insertion receptacle formed as a dovetail receptacle on the workpiece support or the radial arm inner portion, and wherein the bolt receptacle reaches through a side wall located in a direction transverse to the saw blade slot as far as to one of the two inserted insertion pins and through one of the inserted insertion pins, such that the saw blade slot arranged laterally adjacent thereto remains free.