To provide a workpiece holder suitable for holding a workpiece when the workpiece is punched by using an embroiderable sewing machine, and a sewing machine to which the workpiece holder is detachably attached.

A holder frame 81 is mounted in the embroiderable sewing machine and is attached to a transfer means for transferring the workpiece in two prescribed directions for holding the workpiece so that the workpiece is punched with a punch needle attached to a needle bar in the sewing machine. The holder frame 81 includes a connecting part 84 detachably attached to the transfer means, a placement member 89 on which the workpiece is placed, a lower frame 82 in which the connecting part 84 is disposed to support the placement member 89, an upper frame 83 for clamping other parts than the workface to be punched of the workpiece placed on the placement member 89, and a magnet 87 for holding the upper frame 83 clamping the workpiece.