According to an aspect of the present invention, there is provided a light radiating probe which is flexible and uniformly radiates light emitted from a light scattering and radiating portion at all azimuth angles of 360° so as to enable the simultaneous radiation of light to cancers disposed at a plurality of places scattered in a wide region. The light radiating probe for photodynamic therapy according to the present invention includes an optical fiber which extends in an axial direction and through which light from a light source propagates, in which the optical fiber has a light guide portion which is formed by forming thin film cladding on a side surface of a flexible core, and a light scattering and radiating portion which is configured to scatter, with uniform intensity, light propagating through the light guide portion to a periphery of the light scattering and radiating portion in all azimuth angles with respect to an axial direction of the flexible core.
