To provide a highly stable easy-to-mount pole support which is not bulky in storage, a mounting implement, and a plate-like object mounting implement for mounting a plate-like object to be mounted such as a signboard, on a fence etc.

The pole support comprises a tubular body, a frame body, a coupling part for making the tubular body detachable or turnable in such a manner as to selectively bring it into a fallen or raised state, and a fixing means. A support attachment which is used by being mounted on the pole support is equipped with a mounting tube externally or internally inserted into the tubular body, and a pair of pole inserting tubes provided via bridging parts elongated in mutually opposite directions from the mounting tube. The pole mounting implement whose engaging parts are mutually and elastically moved is equipped with a part for enclosing the peripheral surface of a pole, a pair of elongated arms, and the engaging parts which are provided at respective tips of the arms so as to be engaged with a body to be mounted. The plate-like object mounting implement, wherein the tip of a sandwiching arm is provided with an edge engaging part engaged with the edge of the object to be mounted, is equipped with an engaging means, an intermediate member, and a pair of the sandwiching arms which are elongated right and left, respectively.