(57) [summary] [purpose] typhoon, such as in the time of strong wind, so as to be lowered the signboard body to the above-ground parts, is to prevent breakage of the strut. [Configuration] Three of the fixing ring 5 respectively are fixed to a releasable a plurality of supports erected on the ground, the crosspiece 9 in the crosspiece fitting portion 7 of the fixed ring 5 fixed to a different support column 4 is horizontal The in and to fit into and fixed in the horizontal crosspiece 9 of the plurality of at predetermined intervals in the vertical direction into a plurality of supports 4. It attaches the signboard body 1 to crosspiece 9 of the plurality of lines.
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