A combination scale comprising: a plurality of hoppers arranged around a cabinet to receive articles to be weighed thrown therein, the hoppers having gates; driving units configured to open and close the gates of the hoppers; and weighing units configured to weigh the articles thrown in the hoppers; wherein the driving units and the weighing units being housed in the cabinet; characterized in that the combination scale further comprises an ejector configured to be supplied with compressed air to ventilate the cabinet, and an air purge device (23,27) comprising a compressor and a piping arrangement, wherein a part of compressed air from the compressor is supplied to the ejector, and a remaining part of the compressed air from the compressor is introduced into the cabinet through the piping arrangement, wherein the ejector comprises a feeding port that is connected to and is communicating with the compressor to be supplied with the compressed air from the compressor, an air suction port that is connected to and is communicating with an inside of the cabinet by means of a tube, and an air exhaust port that is communicating with an outside of the cabinet, wherein the ejector is configured to suck air from the cabinet through the air suction port and exhaust the compressed air and the air in the cabinet outside the cabinet through the air exhaust port by being supplied with the compressed air through the feeding port, compressed air from the compressor is supplied into the cabinet through the piping arrangement a plurality of hoppers arranged around a cabinet to receive articles to be weighed thrown therein, the hoppers having gates; driving units configured to open and close the gates of the hoppers; and weighing units configured to weigh the articles thrown in the hoppers; wherein the driving units and the weighing units being housed in the cabinet; characterized in that the combination scale further comprises an ejector configured to be supplied with compressed air to ventilate the cabinet, and an air purge device (23,27) comprising a compressor and a piping arrangement, wherein a part of compressed air from the compressor is supplied to the ejector, and a remaining part of the compressed air from the compressor is introduced into the cabinet through the piping arrangement, wherein the ejector comprises a feeding port that is connected to and is communicating with the compressor to be supplied with the compressed air from the compressor, an air suction port that is connected to and is communicating with an inside of the cabinet by means of a tube, and an air exhaust port that is communicating with an outside of the cabinet, wherein the ejector is configured to suck air from the cabinet through the air suction port and exhaust the compressed air and the air in the cabinet outside the cabinet through the air exhaust port by being supplied with the compressed air through the feeding port, compressed air from the compressor is supplied into the cabinet through the piping arrangement wherein the driving units and the weighing units being housed in the cabinet; characterized in that the combination scale further comprises an ejector configured to be supplied with compressed air to ventilate the cabinet, and an air purge device (23,27) comprising a compressor and a piping arrangement, wherein a part of compressed air from the compressor is supplied to the ejector, and a remaining part of the compressed air from the compressor is introduced into the cabinet through the piping arrangement, wherein the ejector comprises a feeding port that is connected to and is communicating with the compressor to be supplied with the compressed air from the compressor, an air suction port that is connected to and is communicating with an inside of the cabinet by means of a tube, and an air exhaust port that is communicating with an outside of the cabinet, wherein the ejector is configured to suck air from the cabinet through the air suction port and exhaust the compressed air and the air in the cabinet outside the cabinet through the air exhaust port by being supplied with the compressed air through the feeding port, compressed air from the compressor is supplied into the cabinet through the piping arrangement