Method for workpiece detection - in which by means of conveying means, a first workpiece (8, 8') is delivered to an optical detection device, by means of which an upper side of the workpiece (8, 8') is detected at least section-wise, - wherein, - in a first method section for further, optical detection of the first workpiece (8, 8'), the first workpiece (8, 8'), after at least section-wise, optical detection of its upper side is delivered by means of the conveying means to a first turning element, by means of which after that the first workpiece delivered to it for turning, is turned such that the first workpiece (8, 8') in the turned state, is delivered again by means of the conveying means for at least section-wise, optical detection of its lower side so that, after at least section-wise, optical detection of its lower side, it is conveyed by means of the conveying means in a conveying direction (30, 32) facing away from the optical detection device, - wherein during the first method section, in a second method section for optical detection of a second workpiece, the second workpiece following the first workpiece is delivered to the optical detection device and, after at least section-wise, optical detection of its upper side, is delivered by means of the conveying means to a second turning element, by means of which after that the second workpiece delivered to it for turning, is turned such that the latter in the turned state is delivered again by means of the conveying means to the detection device for at least section-wise detection of its lower side, - characterised in that a workpiece (8, 8', 22) delivered for turning to the first or the second turning element (16, 20) is turned by the latter about an axis (44, 44'), wherein the first workpiece is turned by the first turning element, while the upper side of the second workpiece is detected at least section-wise by the optical detection device, and the second workpiece is turned by the second turning element, while the lower side of the first workpiece is detected at least section-wise by the optical detection device, wherein the conveying means convey first and second workpiece (8, 8', 22) along a conveying path, wherein the optical detection device is arranged spatially between first turning element and second turning element. - in which by means of conveying means, a first workpiece (8, 8') is delivered to an optical detection device, by means of which an upper side of the workpiece (8, 8') is detected at least section-wise, - wherein, - in a first method section for further, optical detection of the first workpiece (8, 8'), the first workpiece (8, 8'), after at least section-wise, optical detection of its upper side is delivered by means of the conveying means to a first turning element, by means of which after that the first workpiece delivered to it for turning, is turned such that the first workpiece (8, 8') in the turned state, is delivered again by means of the conveying means for at least section-wise, optical detection of its lower side so that, after at least section-wise, optical detection of its lower side, it is conveyed by means of the conveying means in a conveying direction (30, 32) facing away from the optical detection device, - wherein during the first method section, in a second method section for optical detection of a second workpiece, the second workpiece following the first workpiece is delivered to the optical detection device and, after at least section-wise, optical detection of its upper side, is delivered by means of the conveying means to a second turning element, by means of which after that the second workpiece delivered to it for turning, is turned such that the latter in the turned state is delivered again by means of the conveying means to the detection device for at least section-wise detection of its lower side, - characterised in that a workpiece (8, 8', 22) delivered for turning to the first or the second turning element (16, 20) is turned by the latter about an axis (44, 44'), wherein the first workpiece is turned by the first turning element, while the upper side of the second workpiece is detected at least section-wise by the optical detection device, and the second workpiece is turned by the second turning element, while the lower side of the first workpiece is detected at least section-wise by the optical detection device, wherein the conveying means convey first and second workpiece (8, 8', 22) along a conveying path, wherein the optical detection device is arranged spatially between first turning element and second turning element.