A teether which allows the baby to freely move the teeth in the top-bottom and left-right directions. The edge of a projection section (14) of a teether (11) has a recess (14a) curved in a circular arc shape toward the center of the teether (11). The front surface of the projection section (14) has formed therein a groove (20) in which the row of teeth in the upper jaw of the baby is positioned when the baby holds the teether between the teeth. A groove (22) in which the row of teeth in the lower jaw is positioned is formed in the rear surface of the projection section (14).
