Abstract: Providing a new article falling prevention device capable of preventing an article placed on a mounting plate from falling due to vibration such as an earthquake without using any electrically operating member as a component at all. A left end of a load support member is connected to a left rotating rod 15 pivotally supported rotatably by a left support shaft 13 disposed at a front end side middle portion or a rear end side middle portion, a right end of the load support member is connected to a right rotating rod 16 pivotally supported rotatably by a right support shaft 14 disposed at a front end side middle portion or a rear end side middle portion, and the load support member 17 supports all or part of the load of an article W.