A swage apparatus includes a main body for supporting a coupling such that an axis of the coupling is oriented in a first direction, a stopper which comes into contact with one member of a first member or a second member of the coupling and restricts the one member from moving in the first direction, a pusher which comes into contact with the other member of the first member or the second member and pushes the other member in the first direction, and a cover member for covering the coupling so as to prevent the axis of the coupling from becoming displaced. The axis can thereby be prevented from becoming displaced.