The invention relates to an incorporated slide fastener (110) that is incorporated simultaneously with the weaving of the fastener tape (130) for a zigzag-type continuous element chain (121). The weft yarns (135) of the fastener tape (130) are woven with a single yarn traversing and doubling back in the tape width direction, forming a two yarn set, through the same openings created between the warp threads (133, 134, 136). The fastener elements (120) formed from a synthetic resin monofilament have: engaging heads (122) that engage with the opposing continuous element chain (121); first and second legs (123, 124) that each extend on the first surface and the second surface of the fastener tape in the direction of tape width from the engaging heads (122) and pinch the edge of the tape therebetween; first connecting parts (125) that connect, parallel to the tape surface, first legs (123) that are adjacent in the longitudinal direction of the tape; and second connecting parts (126) that connect, parallel to the tape surface, second legs (124, 124) that are adjacent in the longitudinal direction of the tape. Of the two yarns (135-1, 135-2) configuring the weft yarn (135), one yarn (135-2) is woven diagonally straddling the first surface of a first leg (123) and the second surface of a second leg (124) of adjacent fastener elements (120).