A roller and an insert plate-assisted roller securing device are provided. The insert plate-assisted roller securing device includes a wheel-shaped cover, an outer cover, and a bracket. The outer cover has a supported portion with different widths in different directions, and the supported portion can be engaged in the bracket without separating from the bracket. As the outer cover can be coupled to the bracket along with the roller by a single person, installation of the roller is made easier and less time-consuming than before.