To provide a book page presser-CUM-bookmark instrument which holds the state that the book is opened, which has a function as a bookmark, and which can be simply used by simplifying a structure.

The book page presser-CUM-bookmark instrument holds the state that the book 6 is opened by pressing the opened page of the book 6, and has the features that the structure is simple and can be used simply by forming a spiral state or a U-shaped grip, and connecting the sandwiching part 1 of the grip to a press to integrate the sandwiching part 1 of the grip with the press.