To improve a sewing quality in a workpiece by forming an attachment frame 15 attached to a base frame 11 of a sewing frame 10 to be hardly distorted.

The sewing frame 10 for extending and holding an object to be sewn and a driving mechanism 20 which supports the sewing frame 10 to be driven to two directions, i.e., an x-direction being in a juxtaposing direction of a sewing machine head 6 and a y-direction orthogonal to the x-direction, are attached to the sewing table 7 of a multi-head sewing machine. The sewing frame 10 includes: the base frame 11 connected to the driving mechanism 20; and an attachment frame 15 attached to the base frame 11 so as to be adjustable in the y-direction. An attachment frame support mechanism 61 for directly connecting the attachment frame 15 to the sewing table 7 without involving the base frame 11, so as to be make the table 7 slidable in the two x, y-directions and supporting the table is attached between the attachment frame 15 and the sewing table 7.