other by a suitable intermediate layer 215 the inner panels 210 of walls 204 have inner faces 216 towards the interior of showcase 201 the outer panels 212 of walls 204 have outer faces 218 towards the exterior of showcase 201 the inner panel 211 of the upper wall 205 has a lower face 217 towards the interior of showcase 201 the outer panel 214 of wall 205 has an upper face 219 towards the exterior of showcase 201 the side walls 204 are fixedly fastened to the upper wall 205 at respective edges 220 and 221 reciprocally facing each other edges 220 221 of side and top walls are shaped so as to include respective contact bands facing one another and glued to one another in particular showcase 201 includes first horizontal contact bands 222 and 223 the first contact band 222 is formed on edge 220 of each side wall 204 while the first contact band 223 is formed on each edge 221 of the upper wall 205 the first contact bands 222 223 are extended between a common inner bound 224 thereof and a common outer bound 226 thereof wherein the outer bound 224 is located at.