Abstract: A keyboard to which the portable type information apparatus, such as an electronic notebook, a pen computer or a portable digital assistants/terminal equipment, can be directly and detachably connected and by which a large quantity of information can be quickly inputted. The keyboard is provided with a connector, to which a portable type information apparatus is directly and detachably connected, and a plurality of keys through which the apparatus can be operated. The keys are arranged in the keyboard main body, and the connector is arranged in the keyboard movable section. The keyboard movable section is connected to the keyboard main body while an angle formed between the keyboard movable section and the keyboard main body can be arbitrarily changed and the angular position can be held by itself. The keyboard is provided with an engaging section by which the keyboard is mechanically engaged and fixed to the information apparatus.