To quickly carry out mounting work of a door lock knob by one touch operation for fixing a screw cylinder to a rose plate.

A pattern forming a plurality of pairs of holes respectively corresponding to a plurality of pairs of screw cylinder mounting holes 32 formed in the rose plate 3 of the door lock knob 1 on the outdoor side is prepared, the pattern is applied to a pair of guide holes 82 of a door 8, and a pair of holes coinciding with an interval of a pair of guide holes 82 of the door 8 are selected. Then, the pattern is applied to the rose plate 3, a pair of screw cylinder mounting holes 32 coinciding with a pair of selected holes are selected, and a screw cylinder 5 is fixed to each of a plurality of selected screw cylinder mounting holes 32. After that, a pair of screw cylinders 5 are inserted into a pair of guide holes 82 of the door 8, a pair of connecting bolt insertion holes 41 coinciding with an interval of a pair of screw cylinders 5 are selected from a plurality of pairs of connecting bolt insertion holes 41 formed in a set plate 4, and a connecting bolt 6 is screwed in the screw cylinder 5 through a selected pair of connecting bolt insertion holes 41.