A robot system comprising: a conveying device that conveys workpieces (w); a plurality of robots (2a, 2b, 2c, 2d) that performs a working operation on the workpieces (w) conveyed by the conveying device; an image capturing device (3a, 3b, 3c, 3d) that is placed at an upper stream side of the conveying device than the plurality of robots (2a, 2b, 2c, 2d) to capture a conveying path of the conveying device; a workpiece detecting device (511, 515, 531) that detects the workpieces (w) on the conveying path on the basis of an image captured by the image capturing device (3a, 3b, 3c, 3d); and a control device (5, 5a, 5b, 5c, 5d) that controls operations of the plurality of robots, and the control device (5, 5a, 5b, 5c, 5d) including: an operation instruction unit (513, 517, 532) that generates an operation instruction for performing a holding operation on the workpieces (w) on the basis of a detection result of the workpiece detecting device and transmits the operation instruction to the robots; and an allocating unit (512, 519, 534) that determines which of the plurality of robots to which the operation instruction unit transmits the operation instruction on the basis of conveying situations of the workpieces (w) obtained from the detection result of the workpiece detecting device (511, 515, 531), characterized in that the control device (5a, 5b, 5c, 5d) detects directions of the workpieces (w) on the basis of the image, associates the robots (2a, 2b, 2c, 2d) with respective predetermined angular ranges that are not overlapped with each other and instructs the robots (2a, 2b, 2c, 2d) associated with the respective angular ranges to perform the holding operations on the workpieces (w), each of the angular ranges including an angle formed by the detected direction of the corresponding workpiece (w) and a predetermined reference direction. a conveying device that conveys workpieces (w); a plurality of robots (2a, 2b, 2c, 2d) that performs a working operation on the workpieces (w) conveyed by the conveying device; an image capturing device (3a, 3b, 3c, 3d) that is placed at an upper stream side of the conveying device than the plurality of robots (2a, 2b, 2c, 2d) to capture a conveying path of the conveying device; a workpiece detecting device (511, 515, 531) that detects the workpieces (w) on the conveying path on the basis of an image captured by the image capturing device (3a, 3b, 3c, 3d); and a control device (5, 5a, 5b, 5c, 5d) that controls operations of the plurality of robots, and the control device (5, 5a, 5b, 5c, 5d) including: an operation instruction unit (513, 517, 532) that generates an operation instruction for performing a holding operation on the workpieces (w) on the basis of a detection result of the workpiece detecting device and transmits the operation instruction to the robots; and an allocating unit (512, 519, 534) that determines which of the plurality of robots to which the operation instruction unit transmits the operation instruction on the basis of conveying situations of the workpieces (w) obtained from the detection result of the workpiece detecting device (511, 515, 531), an operation instruction unit (513, 517, 532) that generates an operation instruction for performing a holding operation on the workpieces (w) on the basis of a detection result of the workpiece detecting device and transmits the operation instruction to the robots; and an allocating unit (512, 519, 534) that determines which of the plurality of robots to which the operation instruction unit transmits the operation instruction on the basis of conveying situations of the workpieces (w) obtained from the detection result of the workpiece detecting device (511, 515, 531), characterized in that the control device (5a, 5b, 5c, 5d) detects directions of the workpieces (w) on the basis of the image, associates the robots (2a, 2b, 2c, 2d) with respective predetermined angular ranges that are not overlapped with each other and instructs the robots (2a, 2b, 2c, 2d) associated with the respective angular ranges to perform the holding operations on the workpieces (w), each of the angular ranges including an angle formed by the detected direction of the corresponding workpiece (w) and a predetermined reference direction.