An optical fiber connector comprising: a ferrule having a joint end face and a rear end face opposite to the joint end face, said ferrule has two guide pin insertion holes configured such that into each of them a positioning guide pin can be inserted for positioning said ferrule with respect to a ferrule of an opposite optical fiber connector, so as to be pulled out therefrom; an internal optical fiber of which one end portion reaching the joint end face of the ferrule is fixed to the ferrule and of which the other end portion extends from the ferrule, said two guide pin insertion holes are formed on both sides of the ferrule such that the internal optical fiber is pinched therebetween; and a pin clamp that is configured to be attached to a protrusion of the positioning guide pin, so as to be detached therefrom in the direction crossing the guide pin insertion hole, wherein said protrusion protruding from the rear end face side of the ferrule when the guide pin is inserted into the guide pin insertion hole, wherein the pin clamp includes two fitting recessed portions that are configured to be fitted to the protruding portion of the guide pin to regulate the movement of the guide pin in the length direction, wherein the fitting recessed portions are formed to receive and put out the protrusion of the guide pin in the direction crossing the guide pin insertion hole, wherein the pin clamp has a bottom portion and side wall portions formed on both sides of the bottom portion and a space surrounded with the bottom portion and the side wall portions, said space serves as an insertion space of the internal optical fiber, the recessed portions of the pin clamp are formed in the side wall portions on both sides, wherein the pin clamp comprises a pair of extensions having respective holding protrusions protruding inwardly to each other and formed in the side wall portions, said holding protrusions each having an inclined face protruding inwardly from the extension down towards said space; said optical fiber connector further comprises a ferrule boot that covers and is attached to a portion of the internal optical fiber extending from the ferrule; and the pin clamp is formed to insert the ferrule boot into the insertion space such that when the ferrule boot is inserted into the insertion space, the ferrule boot presses the inclined faces of the holding protrusions outwardly to enable insertion of the ferrule boot into the insertion space. a ferrule having a joint end face and a rear end face opposite to the joint end face, said ferrule has two guide pin insertion holes configured such that into each of them a positioning guide pin can be inserted for positioning said ferrule with respect to a ferrule of an opposite optical fiber connector, so as to be pulled out therefrom; an internal optical fiber of which one end portion reaching the joint end face of the ferrule is fixed to the ferrule and of which the other end portion extends from the ferrule, said two guide pin insertion holes are formed on both sides of the ferrule such that the internal optical fiber is pinched therebetween; and a pin clamp that is configured to be attached to a protrusion of the positioning guide pin, so as to be detached therefrom in the direction crossing the guide pin insertion hole, wherein said protrusion protruding from the rear end face side of the ferrule when the guide pin is inserted into the guide pin insertion hole, wherein the pin clamp includes two fitting recessed portions that are configured to be fitted to the protruding portion of the guide pin to regulate the movement of the guide pin in the length direction, wherein the fitting recessed portions are formed to receive and put out the protrusion of the guide pin in the direction crossing the guide pin insertion hole, wherein the pin clamp has a bottom portion and side wall portions formed on both sides of the bottom portion and a space surrounded with the bottom portion and the side wall portions, said space serves as an insertion space of the internal optical fiber, the recessed portions of the pin clamp are formed in the side wall portions on both sides, wherein the pin clamp comprises a pair of extensions having respective holding protrusions protruding inwardly to each other and formed in the side wall portions, said holding protrusions each having an inclined face protruding inwardly from the extension down towards said space; said optical fiber connector further comprises a ferrule boot that covers and is attached to a portion of the internal optical fiber extending from the ferrule; and the pin clamp is formed to insert the ferrule boot into the insertion space such that when the ferrule boot is inserted into the insertion space, the ferrule boot presses the inclined faces of the holding protrusions outwardly to enable insertion of the ferrule boot into the insertion space.