Switch illumination device

A switch illumination device positioned outside a switch, the switch illumination device comprising:

• a switch panel having a receiving chamber, a first through hole, a second through hole, a third through hole, and at least a first resilient element, the at least a first resilient element being fixed inside the receiving chamber, and the switch being exposed from the switch panel through the first through hole;
• a light-emitting unit movably disposed inside the receiving chamber and having a positioning recess, a first end surface, and a second end surface opposing the first end surface, the second end surface abutting against the at least a first resilient element, the first end surface being exposed from the switch panel through the second through hole, and the positioning recess being disposed between the first end surface and the second end surface;
• and
• a fastening and unfastening structure disposed at the receiving chamber and having an engaging element, a second resilient element, and a pressing element, the engaging element having a protruding portion disposed at the positioning recess, the second resilient element being connected between the switch panel and the engaging element, and the pressing element abutting against the engaging element and being exposed from the switch panel through the third through hole.