The present invention improves the air flow structure in the handpiece so that after the outside air flows into the interior of the handpiece, it flows in the longitudinal direction of the lamp and the reflector, thereby improving the heat dissipation function of the lamp and detecting the skin tone of the user. And it relates to a handpiece device for a therapeutic light irradiator whose structure is improved so that the output of the lamp can be adjusted to suit the user. The present invention is a handpiece device for a therapeutic light irradiator having a handpiece that is connected with an external body and a wire and has a lamp built in: It is installed on the front side of the handpiece and detects a user's skin tone A skin sensor transmitting to the control processor side； A lamp output circuit that receives the control signal output based on the detection signal input to the control processor and controls the output of the lamp； An outside air inflow hole formed to be perforated on the bottom surface of the handpiece and formed so that outside air flows into one side of the handpiece； A heat dissipation fan built in the handpiece to blow outside air through the outside air inlet hole and blow it to the induction guide portion of the fan casing； A fan casing having an induction guide portion that guides air to be introduced into the inside through the outside air inlet hole and supplied to the lamp side of the front side； And an outside air outlet hole perforated in the outer circumferential surface of the handpiece so that the outside air exhausted through the exhaust passage between the fan casing 400 and the inner surface of the handpiece 100 is exhausted to the outside of the handpiece.본 발명은 핸드피스 내의 공기 흐름구조를 개선하여 외기가 핸드피스의 내부로 유입된 후에 램프와 반사판의 길이방향으로 흐르도록 하여 램프의 방열기능을 향상시킬 수 있도록 함과 아울러, 사용자의 피부톤을 감지하고 사용자에 적합하도록 램프의 출력을 조절할 수 있도록 그 구조가 개선된 치료광선 조사기용 핸드피스장치에 관한 것이다.본 발명은 외부의 본체와 전선으로 연결되고 내부에 램프가 내장된 핸드피스를 구비한 치료광선 조사기용 핸드피스장치로서: 상기 핸드피스의 전면측에 설치되며, 사용자의
