A light source apparatus for endoscope includes a light source configured to generate illumination light, a light source connector receiving member into or from which a light source connector provided in a connector of an endoscope is inserted or removed, a light blocking unit in which a light blocking plate configured to close an opening portion of the light source connector receiving section is disposed to be openable and closable, and an assist unit including a movable member configured to interlock with the insertion or removal of the light source connector into or from the light source connector receiving section by abutting on the light blocking plate and close the opening portion of the light source connector receiving section to press the light blocking plate in a closing direction in which the illumination light from the light source is blocked.
