An optical connector (1, 101, 201, 301, 401) having a center axis extending between a front end and a rear end, comprising: a rear housing (10, 110, 210, 310, 410) located at the rear end of the optical connector (1, 101, 201, 301, 401), the rear housing (10, 110, 210, 310, 410) allowing an optical fiber cable to be inserted therethrough; an inner housing (20, 120, 220, 320, 420) comprising at a distal end thereof at least one retaining hole (23a to 23d, 123, 223a to 223d) configured to house a ferrule (2a to 2d, 102), the inner housing (20, 120, 220, 320, 420) being housed at a rear portion thereof in the rear housing (10, 110, 210, 310, 410); an outer housing (40, 140, 240, 340, 440) disposed on an outer periphery of the inner housing (20, 120, 220, 320, 420) so as to cover a front portion of the inner housing (20, 120, 220, 320, 420); wherein the outer housing (40, 140, 240, 340, 440) comprises a forward wall (43, 143, 243, 343) covering the distal end of the inner housing (20, 120, 220, 320, 420), the forward wall (43, 143, 243, 343) comprises at least one opening area (44a to 44d, 144a and 144b, 244a to 244d, 344a and 344b): characterized in that the inner housing (20, 120, 220, 320, 420) is configured to allow the rear housing (10, 110, 210, 310, 410) to move linearly with respect to the inner housing (20, 120, 220, 320, 420) along the center axis and to allow the rear housing (10, 110, 210, 310, 410) to rotate with respect to the inner housing (20, 120, 220, 320, 420) about the center axis; wherein optical connector (1, 101, 201, 301, 401) further comprises an arm (30, 130, 230, 330, 430) configured to move linearly together with the rear housing (10, 110, 210, 310, 410) with respect to the inner housing (20, 120, 220, 320, 420) along the center axis; wherein the outer housing (40, 140, 240, 340, 440) is configured to rotate with respect to the inner housing (20, 120, 220, 320, 420) about the center axis by a rotation guiding mechanism cooperating with the arm (30, 130, 230, 330, 430); and wherein the opening area (44a to 44d, 144a and 144b, 244a to 244d, 344a and 344b) is configured to be aligned with the retaining hole (23a to 23d, 123, 223a to 223d) or a fiber exposure face of the ferrule (2a to 2d, 102) when the outer housing (40, 140, 240, 340, 440) is rotated with respect to the inner housing (20, 120, 220, 320, 420) from an initial position to a connected position by the rotation guiding mechanism. a rear housing (10, 110, 210, 310, 410) located at the rear end of the optical connector (1, 101, 201, 301, 401), the rear housing (10, 110, 210, 310, 410) allowing an optical fiber cable to be inserted therethrough; an inner housing (20, 120, 220, 320, 420) comprising at a distal end thereof at least one retaining hole (23a to 23d, 123, 223a to 223d) configured to house a ferrule (2a to 2d, 102), the inner housing (20, 120, 220, 320, 420) being housed at a rear portion thereof in the rear housing (10, 110, 210, 310, 410); an outer housing (40, 140, 240, 340, 440) disposed on an outer periphery of the inner housing (20, 120, 220, 320, 420) so as to cover a front portion of the inner housing (20, 120, 220, 320, 420); wherein the outer housing (40, 140, 240, 340, 440) comprises a forward wall (43, 143, 243, 343) covering the distal end of the inner housing (20, 120, 220, 320, 420), the forward wall (43, 143, 243, 343) comprises at least one opening area (44a to 44d, 144a and 144b, 244a to 244d, 344a and 344b):