ELEMENT AND SLIDE FASTENER

To provide an element and slide fastener with which it is possible to improve up-thrusting strength while maintaining sliding properties during engagement. The present invention is characterized by comprising: a head part 11 in which are formed an engagement convex part 13 that projects from one surface of the head part 11, and an engagement concave part 14 that is formed on the rear side of the engagement convex part 13 on the other surface of the head part 11; and a pair of leg parts 12 that extend from the head part 11, a projecting part 16 that projects toward the inner side of the engagement concave part 14 being formed on the leg part 12 side of the engagement concave part 14. 本发明提供一种能够在维持啮合时的滑动性的同时提高上顶强度的链牙以及拉链，该链牙以及拉链的特征在于，具备：头部(11)，其形成有从一侧的面突出的啮合凸部(13)以及在另一侧的面形成于啮合凸部(13)的背面侧的啮合凹部(14)；以及一对脚部(12)，其从头部(11)延伸，在啮合凹部(14)的脚部(12)侧，形成有向啮合凹部(14)的内侧突出的突出部(16)。