According to an embodiment of the present invention, an anti-slide jig for a clinical test on a sunscreen is coupled to be detachable from an output terminal of a solar simulator including a light source emitting ultraviolet light, an optical fiber guide unit in which the output terminal for irradiating a region to be irradiated with the ultraviolet light is formed on one side, and a pressurizing unit for pressurizing the output terminal. Furthermore, the anti-slid jig comprises: a body unit having a coupling hole into which the output terminal is inserted formed therein; and a protruding tube pressurizing the region to be irradiated while protruding to the region to be irradiated to extend the coupling hole. Therefore, since the region to be irradiated protruding to extend the coupling hole of the body unit is pressurized, a position in the region to be irradiated is fixed due to a stepped part of the region to be irradiated formed on both sides of a contact surface of the protruding tube.
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