A binding processing system comprising: a transport unit (2, 3) that transports a sheet bundle along a transport path; a plurality of processing units (4,5,6) aligned along the transport path; and a housing that accommodates the plurality of processing units (4,5,6) and the transport unit (2,3), wherein windows (10a-10c) for observation of inside are provided in a front face or a top face of the housing at positions corresponding to the plurality of processing units (4,5,6), respectively, the binding processing system further comprising: a control unit that controls the transport unit (2,3) and the plurality of processing units (4,5,6); a lighting unit arranged inside the housing; one or more first sensor units (13, 15a, 15b) that are arranged in the transport unit (2,3) and detect an anomaly of an operation of the transport unit (2,3); and one or more second sensor units (14, 16) that are arranged in the plurality of processing units (4,5,6), respectively, and each detect an anomaly of an operation of a related processing unit of the processing units (4,5,6), wherein the binding processing system stops when the first (13, 15a, 15b) or second sensor unit (14, 16) detects the anomaly, when a system error occurs in the control unit, or when an emergency stop instruction is input to the control unit, wherein the lighting unit is formed of variable-color lighting units (17,17') each arranged in corresponding one of the processing units (4,5,6), wherein each of the variable-color lighting units (17, 17') has a light emitting surface arranged so as to face corresponding one of the windows (10a-10c), and wherein an emission light color from each of the light emitting surfaces changes to indicate operation status of the binding processing system. a transport unit (2, 3) that transports a sheet bundle along a transport path; a plurality of processing units (4,5,6) aligned along the transport path; and a housing that accommodates the plurality of processing units (4,5,6) and the transport unit (2,3), wherein windows (10a-10c) for observation of inside are provided in a front face or a top face of the housing at positions corresponding to the plurality of processing units (4,5,6), respectively, the binding processing system further comprising: a control unit that controls the transport unit (2,3) and the plurality of processing units (4,5,6); a lighting unit arranged inside the housing; one or more first sensor units (13, 15a, 15b) that are arranged in the transport unit (2,3) and detect an anomaly of an operation of the transport unit (2,3); and one or more second sensor units (14, 16) that are arranged in the plurality of processing units (4,5,6), respectively, and each detect an anomaly of an operation of a related processing unit of the processing units (4,5,6), wherein the binding processing system stops when the first (13, 15a, 15b) or second sensor unit (14, 16) detects the anomaly, when a system error occurs in the control unit, or when an emergency stop instruction is input to the control unit, wherein the lighting unit is formed of variable-color lighting units (17,17') each arranged in corresponding one of the processing units (4,5,6), wherein each of the variable-color lighting units (17, 17') has a light emitting surface arranged so as to face corresponding one of the windows (10a-10c), and wherein an emission light color from each of the light emitting surfaces changes to indicate operation status of the binding processing system. a control unit that controls the transport unit (2,3) and the plurality of processing units (4,5,6); a lighting unit arranged inside the housing; one or more first sensor units (13, 15a, 15b) that are arranged in the transport unit (2,3) and detect an anomaly of an operation of the transport unit (2,3); and one or more second sensor units (14, 16) that are arranged in the plurality of processing units (4,5,6), respectively, and each detect an anomaly of an operation of a related processing unit of the processing units (4,5,6), wherein the binding processing system stops when the first (13, 15a, 15b) or second sensor unit (14, 16) detects the anomaly, when a system error occurs in the control unit, or when an emergency stop instruction is input to the control unit, wherein the lighting unit is formed of variable-color lighting units (17,17') each arranged in corresponding one of the processing units (4,5,6), wherein each of the variable-color lighting units (17, 17') has a light emitting surface arranged so as to face corresponding one of the windows (10a-10c), and wherein an emission light color from each of the light emitting surfaces changes to indicate operation status of the binding processing system.