A phototherapy device including: an irradiation probe for radiating irradiation light toward a living body； a probe fixing unit into which the irradiation probe is inserted and at the same time fixed on a living body； an observation module placed on the probe fixing unit and provided with an observation means for observing an irradiation site irradiated with irradiation light which is radiated to the living body； and a moving means capable of moving the observation module to a space where the irradiation probe is to be placed in the probe fixing unit during observation of the irradiation site.
