A ring body to be provided in a pipe joint which can prevent a spigot from separating from a socket by a spigot protrusion engaging with a lock ring from the back side of the socket in the separation direction A of the spigot. The ring body includes a main body part which is inserted into between the inner peripheral surface of the socket and the outer peripheral surface of the spigot to be provided in the pipe joint, and a deviation prevention member that prevents the main body part from deviating to the opening end side of the socket, wherein the main body part moves the spigot in the pipe radial direction with respect to the socket, thereby reducing deviation in the pipe radial direction between the pipe axis of a first pipe and the pipe axis of a second pipe.