An input device with an illuminated roller is provided. The input device includes an upper cover, a lower base, a printed circuit board and an illuminated roller module. The illuminated roller module includes a roller, an encoder, an illuminating device and a supporting member. The illuminating device is disposed within the supporting member, and includes a flexible printed circuit and plural light emitting diodes. The plural light emitting diodes are mounted on the flexible printed circuit. The supporting member has a perforation. The flexible printed circuit of the illuminating device is penetrated through the perforation of the illuminating device and is connected to the printed circuit board. As such, electricity for illuminating is transmitted to the light emitting diodes.