To provide a notebook cover with a notebook storage bag for protection which is adaptable to sizes of notebooks and thicknesses of notebooks, can house pens of various thicknesses, can receive just enough notebooks, is made of the same fabric as a set, and can protect a notebook or a system notebook from staining.

The body of a notebook cover (1) includes three portions, namely, a bent part, a front surface part, and an insertion part. To adjust a cover thickness according to a thickness of a notebook, a pressing belt is disposed in a backside part opposite the insertion part, and a thin steel sheet is stuck thereto. A flat magnet code is stuck to a part which becomes an inside of the bent part. The body of a notebook bag (8) is formed into a bag shape. A pen is received in a pen holder attached to the side face of the inside. To close an upper part during notebook housing, each cord put through a bodkin is pulled from both sides.