Abstract: A keyhole illuminating device incorporating a constantly-lit rocker switch to provide continuous illumination and high visibility, without a significant expenditure of energy. The device is easily installed in a door jamb, proximate to a keyhole. Upon accessing the illuminated rocker switch, a homeowner can actuate it to provide the additional illumination provided by an incandescent lamp, with which to better see the keyhole. A housing and circuit terminals contain the operational components of the device. An incandescent lamp provides means for illuminating the rocker switch on a continual basis. The incandescent lamp operably engages a control element, ultimately engaging an existing door bell transformer. As such transformers output low voltage, the current conveyed therefrom enables the incandescent lamp to illuminate the rocker switch on an ongoing basis, at a minimal power consumption. A second incandescent lamp provides further illumination for a homeowner accessing a keyhole.