Protective sheath

A protective sheath for a portable electronic device and an input device, wherein the portable sheath comprises:

• a first holding component, capable of holding the portable electronic device on a first inner surface of the first holding component from a first rear surface of the portable electronic device;
• a second holding component, capable of holding the input device on a second inner surface of the second holding component from a second rear surface of the input device;
• and
• a support component, having a first foldable plate and a second foldable plate adjacent to each other and capable of being folded relative to each other, wherein a first side edge of the first foldable plate away from the second foldable plate is pivoted to the first holding component, a second side edge of the second foldable plate away from the first foldable plate is glidingly disposed to the second holding component, the first holding component is capable of being unfolded relative to the second holding component and the first foldable plate, so as to enable the portable electronic device to stand on the second inner surface with a support provided by the input device and the first foldable plate, and the first holding component is capable of being folded relative to the second holding component and the first foldable plate, so as to enable the input device and the second inner surface to cover a display surface of the portable electronic device together.