Abstract: Disclosed is a mobile handheld electronic apparatus with a light guide device, which includes: at least one user interface; at least one light-emitting device; and a light conducting device, for conducting the light from the light-emitting device to provide desired light to the user interface, wherein the light-emitting device is located between the user interface and the light conducting device, or the light-emitting device is located between the user interface and the light-emitting device. The light conducting device can further comprise: a first light conducting part, for providing desired light for the first user interface; and a second light conducting part, for providing desired light for the second user interface, wherein the first light conducting part and the second light conducting part are integral; and the light-emitting device is located at the border of the first light conducting part and the second light conducting part.