A multi-optical axis photoelectric sensor system, comprising: an emitter unit (1; 1A to 1C) including a plurality of emitter elements that are aligned linearly; a receiver unit (2; 2A to 2C) including a plurality of receiver elements that are arranged to face the respective emitter elements; and a detection processing unit configured to determine, in a detection area including a plurality of optical axes formed between the plurality of emitter elements and the plurality of receiver elements, whether each of the optical axes is in an interrupted state after optical axis selection corresponding to one scan, and is configured to output a detection signal based on a result of the determination, wherein the detection processing unit is configured such that, when at least one of the plurality of optical axes is constantly interrupted by an object movable within the detection area, floating blanking is activated, when floating blanking is activated, the detection processing unit is configured to output the detection signal upon determining that the number of optical axes in an interrupted state is greater than a preset maximum optical axis number, and is also configured to output the detection signal upon determining that the number of optical axes in an interrupted state is smaller than a preset minimum optical axis number, and when floating blanking is deactivated, the detection processing unit is configured to output the detection signal upon determining that the number of optical axes in an interrupted state is greater than or equal to one, characterized in that when floating blanking is activated, the detection processing unit is further configured to, upon determining that the number of optical axes in an interrupted state is smaller than the preset minimum optical axis number, determine that the floating blanking has an abnormality. an emitter unit (1; 1A to 1C) including a plurality of emitter elements that are aligned linearly; a receiver unit (2; 2A to 2C) including a plurality of receiver elements that are arranged to face the respective emitter elements; and a detection processing unit configured to determine, in a detection area including a plurality of optical axes formed between the plurality of emitter elements and the plurality of receiver elements, whether each of the optical axes is in an interrupted state after optical axis selection corresponding to one scan, and is configured to output a detection signal based on a result of the determination, wherein the detection processing unit is configured such that, when at least one of the plurality of optical axes is constantly interrupted by an object movable within the detection area, floating blanking is activated, when floating blanking is activated, the detection processing unit is configured to output the detection signal upon determining that the number of optical axes in an interrupted state is greater than a preset maximum optical axis number, and is also configured to output the detection signal upon determining that the number of optical axes in an interrupted state is smaller than a preset minimum optical axis number, and when floating blanking is deactivated, the detection processing unit is configured to output the detection signal upon determining that the number of optical axes in an interrupted state is greater than or equal to one, characterized in that when floating blanking is activated, the detection processing unit is further configured to, upon determining that the number of optical axes in an interrupted state is smaller than the preset minimum optical axis number, determine that the floating blanking has an abnormality.