Sewing machine

A sewing machine comprising:

• a needle vertical movement mechanism that is configured to vertically move a sewing needle;
• a moving mechanism that is configured to hold a workpiece having a plurality of layers by a holding frame to move the held workpiece;
• an inner presser-foot device that is configured to vertically move an inner presser foot on an upper side of the workpiece held by the holding frame;
• a control device that is configured to control the moving mechanism based on sewing data in which stitch positions are defined in order in a series of sewing;
• and
• a height detector that is configured to detect a height of the inner presser foot,
• wherein the control device lowers the inner presser foot to an upper surface of the workpiece held by the holding frame, detects the height of the inner presser foot by the height detector, and determines suitability of a thickness of the workpiece, at one or a plurality of stitch positions defined in the sewing data before starting the sewing in accordance with the sewing data.