To provide an auxiliary sheet which is usable in an electronic white board without using adhesive, and to provide an electronic white board having an auxiliary sheet storage part.

The sheet which is used by attaching to a writing-in sheet of the electronic white board is characterized by detachably attaching to the writing-in sheet without using the adhesive, in which an attached surface comprises a suction part and a non-suction part. The electronic white board comprises the writing-in sheet, a reading device for reading a written image written on the writing-in sheet, the auxiliary sheet for the electronic white board which is used by attaching the writing-in sheet and is detachably attached to the writing-in sheet without using the adhesive, and a sheet storage part for storing the auxiliary sheet.