The disclosure provides an illuminating keyboard including a joystick module and a backlight module. The joystick module includes a base portion and a joystick mounted on the base portion. The joystick has a head portion with a first diameter and a neck portion with a second diameter, and the second diameter is smaller than the first diameter. The backlight module includes a light source, a light-guide plate, and a partial opaque diaphragm disposed above the light-guide plate. The partial opaque diaphragm has a body portion, an extending segment, and a first accommodation opening. The extending segment is disposed between the first accommodation opening and the body portion. The first accommodation opening having a third diameter smaller than the first diameter is surrounded by the extending segment. When the joystick module is inserted into the first accommodation opening, an end of the extending segment is firmly attached to the joystick module.