A phototherapy device having a contact carrier, an illumination module, and a phase change heat absorbing module is provided. The contact carrier has a light transmissive portion. The illumination module is disposed on the contact carrier and is provided with an illumination element, and the illumination element emits a beneficial electromagnetic wave through the light transmissive portion. The phase change heat absorbing module is attached to the illumination module and includes a phase change material, and the phase change material absorbs heat from the illumination module via phase change. Thereby, the temperature of the illumination element cold be stably maintained within a range.一種光療裝置，包括：接觸載體、發光模組以及相變式吸熱模組。接觸載體具有透光部；發光模組設置於接觸載體且設有發光元件，發光元件經由透光部射出電磁波；相變式吸熱模組則貼接於發光模組且包含相變化材料，相變化材料則經由相變化而對發光模組吸熱。藉此，可達成讓發光元件的溫度穩定維持於一範圍內的效果。
