A fastening apparatus for a battery terminal case includes a main body having open upper and side portions configured to hold a battery terminal therein, a side body coupled to the open side portion of the main body, and an upper cover, hingedly coupled to the side body, provided at the open upper portion of the main body. Hinge protrusions are formed on opposing sides of one of the side body and the upper cover. Hinge holes are formed on opposing sides of the other one of the side body and the upper cover. The hinge holes are configured to receive the hinge protrusions therein.