Provided is a phototherapy apparatus capable of applying appropriate treatment. Specifically, the purpose of the present invention is to provide a phototherapy apparatus capable of easily supplying adequate treatment light even when a region to be treated is a bent region like finger joints of a patient having severe rheumatoid arthritis, thus making it possible to apply appropriate treatment. This phototherapy apparatus is configured to include: a light guide including a first surface on which an affected part is placed and a second surface on a back surface side of the first surface a light source that outputs therapeutic light to enter an inside of the light guide body and a light guide member that has softness and surface tackiness and is disposed on a part of the first surface.
