A page-turning device for turning a page of an opened book, page-turning device including an adhesive part which adheres to the page of the book; an arm part with the adhesive part provided on a top end, the arm part making the adhesive part go to and fro between a departure position and a destination position such that the adhesive part adheres to the page at the departure position and separates from the page at the destination position; and a drive unit which rotates the adhesive part in relation to the arm part. The drive unit rotates the adhesive part before the adhesive part reaches the destination position so that an adhering portion of the adhesive part is changed, and stops rotation of the adhesive part when the adhesive part adheres to the page.