Abstract: An expandable speaker apparatus includes a speaker body, at least one first electrical connector, and at least one second electrical connector. The first electrical connector is located on a first surface of the speaker body. The second electrical connector is located on a second surface of the speaker body. The first electrical connector corresponds to the second electrical connector, and the first electrical connector is electrically connected with the second electrical connector. Thereby, the speaker body is electrically connected with a second speaker body using an electrical connector that is same as the pair of electrical connectors. The conducting line is not required, and the speaker apparatus is expandable.