Abstract: A protective holder for a portable electronic device, such as a personal computer, wireless telephone or communicator, hand-held game or the like, in the form of a lidless enclosure having a bottom member, a front wall, a rear wall and two side walls, the four walls extending upwardly from bottom member as a one-piece unitary structure, the top edges of the front wall, rear wall and two side walls extending inwardly to form a continuous retaining flange. The protective holder is constructed from a water-resistant, flexible and resilient material such that the enclosure fits snugly about the electronic device in order to provide protection from impact shock, spillage, and other hazards. The exterior surfaces of the front wall and rear wall are provided with a plurality of vertically extending ribs which join a plurality of bottom ribs extending across the bottom member in a continuous manner.