To fit an around-gate device to an around-gate support in a well- settled state with the work execution easy.

An around-gate support 1 is formed in approximately H-shape cross section and erected at the entrance of a building. A web piece 1a of the around-gate support 1 is provided with fitting holes 1c adjustable in the fitting position in a height direction. A fixture 2 is formed being provided with a base piece 2a to be fixed to the web piece 1a of the around-gate support 1, and a holding piece 2b for holding an around-gate device 3. In the state of the base piece 2a of the fixture 2 being held between flange pieces 1b, the base piece 2a is thread-fixed using the fitting hole 1c, and the around-gate device 3 is fitted to the holding piece 2b of the fixture 2.