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A sewing machine (1) with a sensor (34) for the detection of work-piece thickness (dl; d2) comprises a base plate (2) including a bearing plate (23) for a work piece (24; 24, 25), a standard (3) being formed on the bearing plate (23), having an adjoining arm (4) which includes a head (5); a stitch- forming place (21) with a sewing needle (11); a feed arrangement (30) for feeding the work piece (24; 24, 25) in a feed direction (31), the sensor being an ultrasonic sensor (34) disposed upstream of the stitch-forming place (21) in the feed direction (30) and above the bearing plate (23) and having a circuit (36) for transmission, to an electric control system (38), of a measured value that corresponds to the thickness (dl; d2) of the work piece (24; 24, 25), and the control system (38) being connected to a unit (37) for transmission of alter commands in dependence on the detected thickness (dl, d2) to at least one servo component (15, 29) and/or to a driving motor (9) on the sewing machine (1). (FIG.1).