A shield terminal (30) includes a dielectric (40) configured to accommodate inner conductors (32) and an outer conductor (43) surrounding the dielectric (40), and is mountable into a selected one of first housing (10) and a second housing (20). A first locking portion (55) and second locking portions (57) are formed on an outer surface of the outer conductor (40). The shield terminal (30) inserted into a first accommodation chamber (13) is retained by a front retainer (17) restricting the resilient deflection of a first locking lance (14) and the first locking portion (55) being to the first locking lance (14). The shield terminal (30) inserted into a second accommodation chamber (21) is retained by the locking of the first locking portion (55) and a second locking lance (22) and the locking of the second locking portions (57) and a side retainer (24).