A foldable cover for protecting or supporting a portable electronic device is provided. The foldable cover comprises a supporting unit and a fixing unit. The supporting unit comprises a plurality of first separations, a convergent part and a plurality of first slab-shaped parts. Each first separation is connected to the convergent part. The fixing unit is connected to the supporting unit to fix the portable electronic device. When the first slab-shaped parts are located at the same surface, the supporting unit covers the portable electronic device. When a three dimensional structure is formed by the first separations, the convergent part and the first slab-shaped parts, the supporting unit supports the portable electronic device.