A connector comprising: a housing (26;45) having an accommodating chamber formed in a connector-engaging direction and first locking means formed in the accommodating chamber; and a core (27;46) made of resin and accommodating an insert-molded terminal (21;22), comprising second locking means which engages the first locking means of the accommodating chamber. The core is held in the accommodating chamber due to the engagement between the first locking means and the second locking means. A locking wall projecting into the accommodating chamber locks an end of the core.