An electronic apparatus (10) includes an enclosure (30), an antenna (20) and a locking mechanism (40). The antenna has a mount end (24) and an opposite free end (22). The mount end is pivotably mounted to the enclosure. The free end defines an engaging groove (220) therein. The locking mechanism includes a hook (50) for being engaged in the engaging groove of the antenna, a resilient mount (60) connected with the hook and capable of rotating with the hook, a supporting unit (80) for mounting the resilient mount to the enclosure, and a elastic member (70) for providing a resilient force when the hook and the resilient mount rotates.