A keyboard includes a plurality of key tops having areas where light is transmitted; a gear link part provided below the key top and configured to vertically move the key top, a housing part provided below the key top, the housing part being configured to hold the gear link part; a rubber actuator configured to provide a reaction force based on vertical motion of the key top; a membrane sheet provided below the rubber actuator and having a contact, the contact being configured to open and close based on the vertical motion of the key top; a support panel provided below the membrane sheet, the support panel being configured to fix the gear link part with the housing part; a light guide plate provided below the support panel; and a light emitting diode configured to emit the light to a side surface of the light guide plate.