To provide a post-installed anchor set capable of obtaining a stable fixation strength through simple installation work.

A post-installed anchor set comprises an anchor bolt 10, a sleeve 40, a washer 20 and a nut 30. In the anchor bolt 10, a bolt head 11 is formed in a tapered shape so as to be narrow towards a distal end of a bolt shank, and a male screw 14 is formed in a first half of the bolt shank. A pin tail 15 is formed in the distal end of the bolt shank via a notch 16 which is fractured by a predetermined torque, and the anchor bolt 10 is inserted from the bolt head into a mounting hole 51 which is opened on a ground 50. The sleeve 40 is tapered on an inner surface 41 of a distal end portion and externally covers the bolt shank. The washer 20 is abutted with an upper end of the sleeve, and the nut 30 is threaded with the male screw of the anchor bolt and abutted to the washer. By relatively revolving the nut and the pin tail, the sleeve relatively rides on the bolt head and is expanded and pressed against an inner surface of the mounting hole, and the pin tail is fractured at the notch when reaching the predetermined torque.