A reclining device includes a first member, a second member which is stacked at an open side of the first member, a pawl which is movably provided with the second member, a rotating cam which is provided to be rotatable about an axis of the relative rotation and includes a hook portion having a hook shape a guide which is formed with the second member and guides the pawl between a locked position and the unlocked position and a cam which is provided among the rotating cam, the pawl and the guide.