Ferrule connecting structure

A ferrule connecting structure for optically connecting a pair of fibers which are provided in a pair of ferrules, respectively, the ferrule connecting structure comprising:

• a first holding portion which holds the pair of ferrules in a state that end faces of the pair of ferrules are opposed to each other and connected with each other;
• a peripheral portion which is provided on at least one of the pair of ferrules and which includes an peripheral surface on which a plurality of groove portions are formed;
• a second holding portion which is configured to fit in the groove portion so as to hold the ferrule in a particular rotating position about an axis of the optical fiber;
• a third holding portion which is configured to be detachably attached to the first holding portion so as to press the first holding portion by elastic force in a direction which intersects with the axis;
• and
• a fourth holding portion which presses the pair of ferrules by elastic force in a direction in which the end faces of the pair of ferrules are opposed to each other.