To provide a connecting structure of a panel to a strut in a partition capable of easily and surely preventing the shakiness between the strut and the panel and, carrying out shakiness prevention work even after the connection of the strut to the panel has been complete.

An inward projection 5a is provided to an opening section to provide a vertical fitting groove 5 having the inside width larger than an opening width to the side of the strut 2, the side end of the panel 1 is fitted to the fitting groove 5, and a shakiness preventive elastic body 6 of the panel 1 is fitted into a space S between one or the other side of the side in the fitting groove 5 and the side of the panel opposed thereto, and the elastic body 6 is partially engaged with the inside of the inward projection 5a to prevent the elastic body 6 from being slipped out of the fitting groove 5.