The automatic bookmark includes a first fixing portion (2) and a second fixing portion (3) to be fixed to the respective front and back covers of a book W or the like; a bookmark portion (6) to be inserted between the closed pages; a first arm portion (4) whose base end is connected to the first fixing portion (2) and leading end is connected to the bookmark portion (6); and a second arm portion (5) whose base end is connected to the second fixing portion (3) and leading end is connected to the bookmark portion (6). A joint portion (11) is provided that connects the leading end of the first arm portion (4) and the leading end of the second arm portion (5). The bookmark portion (6) has a shape whose one end is connected to the joint portion (11) and another end is directed to between the pages.

The automatic bookmark includes a first fixing portion (2) and a second fixing portion (3) to be fixed to the respective front and back covers of a book W or the like; a bookmark portion (6) to be inserted between the closed pages; a first arm portion (4) whose base end is connected to the first fixing portion (2) and leading end is connected to the bookmark portion (6); and a second arm portion (5) whose base end is connected to the second fixing portion (3) and leading end is connected to the bookmark portion (6). A joint portion (11) is provided that connects the leading end of the first arm portion (4) and the leading end of the second arm portion (5). The bookmark portion (6) has a shape whose one end is connected to the joint portion (11) and another end is directed to between the pages.