The oath was administered by Speaker Matiullah Agha.
The newly elected members of Punjab Assembly and National Assembly were also sworn in earlier during the day.
The Pakhtunkhwa Milli Awami Party (PkMAP) secured 10 provincial assembly and three national assembly seats, emerging as the largest parliamentary group in Balochistan.
The Baloch nationalist group, National Party (NP), got eight provincial assembly seats and two national assembly seats. The PML-N and Majlas Wahdat ul Muslimeen (MWM) each won one seat.
The former ruling party PPP could not retain a single seat in Balochistan.
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