To provide a fixing structure not allowing contact of a fixing material with a fixed object as thoroughly as possible in the fixing material composed of a clayey composition to expand a use range of the fixing material.

In this fixing structure, a plastic film 2 is interposed between a bottom-shaped face or a recessed face of the fixed object 3 and the clayey composition 1, and the fixed object 3 is fixed to a mounting face 4 by the clayey composition 1. Fixing force is effectively obtained by restraint force caused by shape. The clayey composition 1 can adopt oil clay, resin clay, silicone bouncing putty or paraffin wax. The plastic film 2 can adopt metal foil, aluminum foil, soft synthetic resin film, a wafer or the like. Appearance, a problem of a color, and weather resistance are improved by shutting off the clayey composition 1 from the outside.