Idara ya mambo ya nje inachukua jukumu la mambo yote ya nje, yanayohusu uhusiano wa Dola ya Khilafah na nchi za nje, haijalishi mambo haya na uhusiano huu ni yapi. Iwe yanahusiana na upande wa kisiasa na yale yanayohusisha, kama vile kuunda mikataba, mikataba ya amani, kusitisha mapigano, mazungumzo, kuteua mabalozi, kutuma wajumbe na mawakilishi, na kuanzisha ubalozi na konseli. Pia inajumuisha uhusiano unaohusiana na mambo ya kiuchumi, kilimo, na biashara, pamoja na mawasiliano ya posta au mawasiliano ya waya na yasiyo na waya n.k. Mambo haya yote yanaendeshwa na idara ya mambo ya nje, kwa sababu yanahusu uhusiano wa Dola ya Khilafah na mataifa mengine.

The foreign affairs department undertakes the responsibility of all foreign affairs, pertaining to the relation of the Khilafah State with the foreign States, whatever these affairs and relations may be. Whether they are related to the political aspect and what it entails in the forming of pacts, peace treaties, cease-fires, negotiations, appointing ambassadors, sending messengers and delegates, and establishing embassies and consulates. It also includes relations, which are related to matters that are economical, agricultural, and are to do with trade as well as postal communications or wire and wireless communications etc. All of these matters are run by the foreign affairs department, because they are concerned with the relations of the Khilafah State with other States. .