To provide a coupling device for a laid tatami mat which can be easily peeled without leaving marks on a floor surface when being stuck to it and can be adhered again even after being temporarily peeled, by using a self-adhesive member as an antislip adsorbent.

The coupling device for the laid tatami mat fixes a self-adhesive pad to the whole or part of an undersurface of a plate which forms at least two projections thereon to fit into holes formed at the corners of a tatami unit.