An irradiation module (18) mechanically detachably attached to a light source module includes a first light source light entrance end (74) which allows entry of first light source light emitted from a first light source module (12), a first light guide member (66) to guide the first light source light which has entered the first light source light entrance end, a second light source light entrance end (76) which allows entry of second light source light emitted from a second light source module (14) different from the first light source module, and a second light guide member (68) to guide the second light source light which has entered the second light source light entrance end； and the first light guide member and the second light guide member have optical specifications which correspond to optical characteristics of the light source light to be guided and in which the optical characteristics are different from each other.
