To prevent the trouble and early detachment of the teeth or the implant by alleviating pressure due to a denture.

A traveling elastic force is energized via a spring 4 to a magnet body 3 supported with a cover 2 so as to be capable of freely traveling, thereby forming an attachment 1. Furthermore, this attachment 1 is fixed to a denture A, and a keeper body 5 to be attracted to the magnet body 3 is buried in a residual ridge B. The denture A is secured via the attraction of the keeper body 5 with the magnet body 3. At the same time, pressure applied due to the denture A is alleviated via the travel of the magnet 3.