To make it possible to fix an installed article with a pedestal easily without requiring the bothersome positioning between a screw and a screw hole when fixing the installed article such as knob, etc, to cover the pedestal fixed to a door panel etc.

A pedestal 16 is screwed to an installation object 14 that should attach an installed article 12 and this pedestal 16 is covered by the installed article 14. It has a stopping pin 26 pressed by a spring so as to protrude from the outer circumference face in the pedestal 16 and a fit-in part 32 to fit this stopping pin 26 is formed in the installed article 12 and a guide slope face 34 is established to guide the retraction of the stopping pin 26 against the spring pressed power when the installed article 12 covers over the pedestal 16. The stopping pin 26 can be retracted along this guide slope face 34 when the installed article 12 is covered over the pedestal 16, the stopping pin 26 fixes the installed article 12 to the pedestal 16 by engaging into the fit-in part 32 of the installed article 12 by the spring 28 when the installed article 12 covers completely over the pedestal 16.