A portable electronic device comprises a housing, a display protecting lens, a display and a light guiding element. The housing has an opening and a trough defined therethrough. The display protecting lens is mounted in the opening of the housing. The display is mounted with the first light guiding element in the housing. The light guiding element is accommodated in the trough. The portable electronic device further includes a light guiding member located between the display protecting lens and the display, a portion of the light emitted by the display is guided by the light guiding member and then transmitted to the light guiding element.