A luminous keyboard includes a key structure, a supporting plate, a switch circuit board, a light guide plate and a top-view light-emitting element. The supporting plate includes an opening. The top-view light-emitting element emits a light beam. The supporting plate is located under the key structure. The switch circuit board is located over the supporting plate. The light guide plate is located under the supporting plate and includes a light guide plate opening. The top-view light-emitting element is inserted into the opening. After the light beam is transmitted through the opening, a first-portion beam of the light beam is transmitted through the switch circuit board and projected to a first region of the key structure. A second-portion beam of the light beam is sequentially blocked by the switch circuit board, introduced into the light guide plate, and guided to a second region of the key structure.