A boot and an optical connector ferrule connectable with the boot so as to form an optical connector, comprising: a ferrule body including an insertion opening portion formed at a rear end side of the ferrule body so as to support the boot, wherein the longitudinal and lateral width dimensions of the insertion opening portion of the ferrule body are set to be substantially equal to or slightly larger than the longitudinal and lateral width dimensions of the boot, wherein said boot is configured to have an optical fiber at a front end while the boot is inserted into the insertion opening portion, optical fiber insertion holes formed at a front end side of the ferrule body, wherein the optical fiber insertion holes are configured to expose a front end of the optical fiber outward while the front end of the optical fiber is inserted into an inner deep portion of the insertion opening portion, and an adhesive charging window portion formed at an upper surface of the ferrule body, wherein the adhesive charging window portion is configured to receive an injected adhesive so as to fix the optical fiber in a manner such that the adhesive is charged from the inner deep portion of the insertion opening portion to a rear end opening portion of the optical fiber insertion hole, and the boot, wherein the outer surface of the boot is formed substantially square tubular provided with an adhesive storage portion (23a, 23b, 23c, 23d) formed in a concave shape at upper and lower symmetrical positions of the outer surface of the boot, characterized in that the outer surface of the boot is provided with a protrusion (22a, 22b, 22c) formed at the upper and lower outer surface or in the entire circumference of the outer surface of the boot in a direction orthogonal to the boot inserting direction so as to be crushable when the protrusion is inserted into the insertion opening portion of the rear end side of the ferrule body, and said adhesive storage portion (23a, 23b, 23c, 23d) is provided at the front and rear side of and parallel to the protrusion (22a, 22b, 22c) and is configured to stop the adhesive injected in the adhesive charging window portion of the ferrule body from leaking from a gap between the boot and the insertion opening portion of the rear end side of the ferrule body, and in that an adhesive guide groove is provided at the front edge side of the adhesive storage portion located at a front end of the boot, wherein the adhesive guide groove is configured to guide the adhesive into the adhesive storage portion. a ferrule body including an insertion opening portion formed at a rear end side of the ferrule body so as to support the boot, wherein the longitudinal and lateral width dimensions of the insertion opening portion of the ferrule body are set to be substantially equal to or slightly larger than the longitudinal and lateral width dimensions of the boot, wherein said boot is configured to have an optical fiber at a front end while the boot is inserted into the insertion opening portion, optical fiber insertion holes formed at a front end side of the ferrule body, wherein the optical fiber insertion holes are configured to expose a front end of the optical fiber outward while the front end of the optical fiber is inserted into an inner deep portion of the insertion opening portion, and an adhesive charging window portion formed at an upper surface of the ferrule body, wherein the adhesive charging window portion is configured to receive an injected adhesive so as to fix the optical fiber in a manner such that the adhesive is charged from the inner deep portion of the insertion opening portion to a rear end opening portion of the optical fiber insertion hole, and the boot, wherein the outer surface of the boot is formed substantially square tubular provided with an adhesive storage portion (23a, 23b, 23c, 23d) formed in a concave shape at upper and lower symmetrical positions of the outer surface of the boot, characterized in that the outer surface of the boot is provided with a protrusion (22a, 22b, 22c) formed at the upper and lower outer surface or in the entire circumference of the outer surface of the boot in a direction orthogonal to the boot inserting direction so as to be crushable when the protrusion is inserted into the insertion opening portion of the rear end side of the ferrule body, and said adhesive storage portion (23a, 23b, 23c, 23d) is provided at the front and rear side of and parallel to the protrusion (22a, 22b, 22c) and is configured to stop the adhesive injected in the adhesive charging window portion of the ferrule body from leaking from a gap between the boot and the insertion opening portion of the rear end side of the ferrule body, and in that an adhesive guide groove is provided at the front edge side of the adhesive storage portion located at a front end of the boot, wherein the adhesive guide groove is configured to guide the adhesive into the adhesive storage portion.