An artificial nipple can include a nipple tip section that can sufficiently reach the sucking fossa and can be appropriately squashed The artificial nipple can have a base section that widens to match an attachment object, an areola section formed contiguously to the base section and that extends while narrowing gradually, and a nipple section that extends from the areola section and that narrows more than the areola section. A flange section can be provided in the base section with a predetermined thickness. A check valve can be formed with a valve body so as to be entirely accommodated within the thickness dimension of the flange, and provided in the base section.