The present invention relates to a sterilizing device. More specifically, the present invention relates to a sterilizing device having a condenser installed between a sterilizing chamber and a vacuum pump. The sterilizing device according to the present invention comprises: a sterilizing chamber a sterilizing means supply unit for supplying a sterilizing means to the sterilizing chamber and a vacuum pump connected with the sterilizing chamber. The sterilizing device further comprises: a condensing device installed between the sterilizing chamber and the vacuum pump and a weight sensor installed in the sterilizing chamber, and measuring the weight of a treated material in the sterilizing chamber. The condenser comprises: a first line for flowing a gas discharged from the sterilizing chamber, having one end connected with the sterilizing chamber, and having the other end opened a gas cooling unit for cooling the gas flowing in the first line, and condensing a part of the gas and a gas and liquid tank having an internal space for accommodating a liquid and the gas discharged from the other end opened in the first line, having a gas discharging hole connected with the vacuum pump and discharging gas discharged from the other end opened in the first line, and having a liquid discharging hole for discharging the liquid discharged from one end opened in the first line. The sterilizing device according to the present invention can prevent the inflow of a liquid to the vacuum pump by using the condenser. Accordingly, the lifespan of the vacuum pump can be increased, and the degradation of a sterilizing effect caused by the degradation of the vacuum pump can be prevented.본 발명은 멸균장치에 관한 것으로서, 더욱 상세하게는 멸균실과 진공펌프 사이에 설치된 응축장치를 구비한 멸균장치에 관한 것이다. 본 발명에 따른 멸균장치는 멸균실과, 상기 멸균실에 멸균수단을 공급하는 멸균수단공급장치와, 상기 멸균실과 연결된 진공펌프를 구비하는 멸균장치로서, 상기 멸균실과 상기 진공펌프 사이에 설치된 응축장치와, 상기 멸균실의 내부에 설치되며, 상기 멸균실 내의 피처리물의 무게를 측정하는 무게감지센서를 더 포함하며, 상기 응축장치는, 상기 멸균실에서 배출된 기체가 흐르며, 일단은 상기 멸균실과 연결되고, 타단은 개방된 제1라인과,
