A luminous keyboard includes a membrane wiring board, a key structure and a light-emitting element. The membrane wiring board includes a membrane switch. The membrane switch is electrically conducted through the key structure. The key structure includes a keycap, a connecting element and a soft light-shading element. The connecting element is arranged between the membrane wiring board and the keycap. The keycap is movable upwardly or downwardly relative to the membrane wiring board through the connecting element. The soft light-shading element is connected with the keycap and arranged around the connecting element. The at least one light-emitting element provides plural light beams. After first portions of the plural light beams are transmitted through the membrane wiring board, at least portions of the plural light beams are outputted from at least one light-transmissible region of the keycap. Consequently, the light utilization efficiency is enhanced.