To provide a bookmarker, the number of the replacement of which can be reduced, with which a page read just before can be easily opened even when a book is closed against a reader's will and which is easily turned up when the page is turned up.

In this bookmarker, the width of a bookmarker main body part 20 is limited to that of the conventionally normally used bookmarker so as to lighten the weight of the bookmarker, the frictional force of a paginal surface is heightened by making an interval between the bookmarker main body part 20 and a bookmarker part 30 narrower to some extent so as to constitute the bookmarker 33 not to slip off even during its movement within the width of a book. In addition, in this bookmarker, a narrower continuous part 31 is provided between the bookmarker main body part 20 and the bookmarker part 30 under the constitution that the width of the bookmarker part 30 becomes narrower as the bookmarker part 30 approaches its tip.