PROBLEM TO BE SOLVED: To provide a phototherapy device capable of performing phototherapy under an appropriate temperature. SOLUTION: The phototherapy device 1 performs phototherapy to irradiate a human body with light rays, and has a light source 27 for irradiating light rays and a temperature sensor 28 for detecting the temperature in the vicinity of a predetermined region of the human body irradiated with light rays. A control unit 15 that controls the intensity of light rays emitted by the light source 27 based on the detection temperature detected by the temperature sensor 28 is provided. When the detection temperature reaches a predetermined high-temperature side threshold temperature, the control unit 15 activates a preparation mode for reducing the intensity of the light rays emitted by the light source 27. [Selection diagram] Fig. 3【課題】適切な温度下での光線治療をなし得る光線治療器を提供する。【解決手段】人体に光線を照射する光線療法を行う光線治療器１であって、光線を照射する光源２７と、光線が照射された人体の所定の領域近傍の温度を検知する温度センサ２８と、温度センサ２８が検知した検知温度に基づいて、光源２７が照射する光線の強度を制御する制御部１５と、を備える。制御部１５は、検知温度が所定の高温側閾値温度に達した時に、光源２７が照射する光線の強度を減少させるための準備モードを発動する。【選択図】図３
