A light guide plate includes a light shielding plate body, a light guide plate body and a plurality of light source receiving spaces. The light shielding plate body includes a peripheral frame, a plurality of longitudinal and transverse partition strips provided in the peripheral frame, and a plurality of light guide regions cooperatively defined by the peripheral frame and the longitudinal and transverse partition strips. The light guide regions are configured to respectively align with the keys. The light guide plate body includes a plurality of light guide blocks embedded in the light guide regions, respectively. The light source receiving spaces correspond to the light guide blocks.