Jig plate and end face polishing method

A jig plate opposed to a rotating and fluctuating polishing plate of an end face polishing machine for polishing the end face of a ferrule cylindrical member that holds the tip of an optical fiber, for polishing the face of the ferrule cylindrical member into a convex curve inclined with respect to a plane perpendicular to the axis, with the ferrule cylindrical member brought into contact with the polishing plate at a predetermined angle, comprising:

• a jig plate body having a part for mounting to the end face polishing machine;
• and
• a holding part provided to the jig plate body for detachably holding an optical connector plug, the holding part holding the optical connector plug while correcting the target inclining direction of the polished convex curve of the ferrule cylindrical member so as to turn to a direction opposite to the rotating direction of the polishing plate with respect to a plane including the center of the jig plate body and the axis of the optical fiber so that the inclining direction of the polished convex curve of the ferrule. cylindrical member held by the optical connector plug coincides with the reference direction of the optical connector plug.