The present disclosure provides an exterior cover of an electronic device including a cover that protects a display of the electronic device. The cover may include one or more speakers. The cover may be folded one or more times to support the electronic device to be inclined and the speaker may include any one of a film speaker, a vibration speaker, a piezoelectric speaker, and a thin micro speaker. In addition, the exterior cover may include a vibration plate that is arranged thereon and any electronic component may also be arranged on the exterior cover as long as the electronic component is slim.