A double-sided engaging element for a slide fastener, comprising a central elevated portion elevated from a coupling base surface; and a pair of right and left projecting portions formed to project from a body portion toward the central elevated portion and to be elevated from the coupling base surface, wherein a central elevated portion of a mating element is detachably coupled in a dent surrounded by the central elevated portion, the right and left projecting portions and a stepped surface. A dimension (T0) between inside elevation startup edges of the right and left projecting portions is set smaller than a dimension (R0) between right and left elevation startup edges of the central elevated portion, and a first missing portion is formed on an outside corner of an end portion of each of the right and left projecting portions opposing the central elevated portion.