A slide hinge comprising a slide hinge main body, a coupling case of synthetic resin, and a coupling piece (4a, 4b) for openably and closably connecting said slide hinge main body and said coupling case via hinge pins (7c, 7d), wherein said coupling case has a coupling piece housing groove portion, a housing concave portion and attaching means (6a, 6b), wherein said attaching means (6a, 6b) are composed of a pair of attaching case portions (8, 9) continuously provided integrally with both side portions of the coupling case, and diameter enlarging means (12, 13) provided in each of the attaching case portions (8, 9), characterised in that said coupling case has a reinforcing frame body that has substantially the shape of U and comprises a curved and narrow base portion and a pair of slightly wider fixing portions (10b, 10b) provided in connection with and in parallel to the base portion; hinge pin coupling holes (10c, 10d) are provided on the base portion, a pair of first locking pieces (10e, 10e) are provided on the base portion of the fixing portions (10b, 10b); a pair of second locking pieces (10f, lOf) are provided on their respective free end sides so as to protrude in a horizontal direction; a pair of first abutting portions (10g, 10g) for abutting a bottom portion of the coupling case, and second abutting portions (10h, 10h) are respectively provided; and said hinge pins (7c, 7d) are inserted in said hinge pin coupling holes (10c, 10d), said pair of first locking pieces (10e, 10e) are inserted in locking holes (5h, 5h) of said coupling case, and said second locking pieces (10f, 10f) are inserted in saiel locking holes (5g, 5g) on the housing concave portion of said coupling case. wherein said coupling case has a coupling piece housing groove portion, a housing concave portion and attaching means (6a, 6b), wherein said attaching means (6a, 6b) are composed of a pair of attaching case portions (8, 9) continuously provided integrally with both side portions of the coupling case, and diameter enlarging means (12, 13) provided in each of the attaching case portions (8, 9), characterised in that said coupling case has a reinforcing frame body that has substantially the shape of U and comprises a curved and narrow base portion and a pair of slightly wider fixing portions (10b, 10b) provided in connection with and in parallel to the base portion; hinge pin coupling holes (10c, 10d) are provided on the base portion, a pair of first locking pieces (10e, 10e) are provided on the base portion of the fixing portions (10b, 10b); a pair of second locking pieces (10f, lOf) are provided on their respective free end sides so as to protrude in a horizontal direction; a pair of first abutting portions (10g, 10g) for abutting a bottom portion of the coupling case, and second abutting portions (10h, 10h) are respectively provided; and said hinge pins (7c, 7d) are inserted in said hinge pin coupling holes (10c, 10d), said pair of first locking pieces (10e, 10e) are inserted in locking holes (5h, 5h) of said coupling case, and said second locking pieces (10f, 10f) are inserted in saiel locking holes (5g, 5g) on the housing concave portion of said coupling case.