An outward-folding display device includes a casing unit and a display protection module. The casing unit includes first and second casings and a sliding board slidably mounted to the second casing. The second casing has a plurality of buffer slots. The display protection module is mounted in the second casing, and includes a plurality of buffer blocks and a plurality of resilient members. The buffer blocks slidably and respectively engage the buffer slots, and are connected to the sliding board. The resilient members are connected between the second casing and the sliding board for biasing the sliding board toward its default position when the buffer blocks are moved in a folding process of the outward-folding display device.