A connection device includes a base and a bracket. The base includes an upper feature, a lower feature, and a middle wall disposed between the upper and the lower features. The middle wall includes a guiding structure and a position-limiting structure that define a moving space therebetween. The bracket is configured to be movably mounted on the base and includes an upper portion, a lower portion, and a middle portion disposed between the upper and the lower portions. The middle portion includes an elastic portion configured to be mounted in the moving space. The upper and the lower portions of the bracket are configured to be mounted to the upper and the lower features of the base respectively.