Fourteen cabinet members also took the oath administered by the Balochistan governor.
Balochistan Chief Minister Mir Quddus Bizenjo on Saturday promised to give healthcare, education and clean drinking water to the people during his reign, while delivering his inaugural speech in the Balochistan Assembly.
Speaking to reporters, Bizenjo said that he will come up to the expectations of the parties who have expressed their confidence in him.
Pakhtunkhwa Milli Awami Party's (PkMAP) Agha Syed Liaqat Ali was the only contestant against Bizenjo after Abdul Rahim Khan Ziaratwal, also of PkMAP, stepped down in his favour.
Talking to the media after his election, he dismissed speculations about the dissolution of Balochistan Assembly, terming them as "mere rumours".
Bizenjo is the third chief minister of the province in four-and-a-half years.
He thanked the House for electing him as Leader of the House with an overwhelming majority. He was elected from the PB-41 constituency.
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Zehri, the former chief minister of Balochistan, was reportedly asked to resign ahead of the session to spare his party - the Pakistan Muslim League-Nawaz (PML-N) - further embarrassment after Prime Minister Shahid Khaqan Abbasi failed to win over the disgruntled elements in the Balochistan Assembly.
Born in 1974, the Pakistan Muslim League-Quaid first became a lawmaker in 2002 and remained Deputy Speaker from 2013-15.
Bizenjo from Pakistan Muslim League-Quaid (PML-Q) is the former deputy speaker of the assembly and played role in the ouster of Zehri.
Bizenjo was elected as member in 2013 elections from Awaran region of Balochistan.
The political crisis began with Bizenjo submitting a no-confidence motion against the chief minister on January 2. His party had just five members in the house of 65.
A political crisis developed in Balochistan following the no-confidence motion, with efforts stepped up by the PML-N, which has a government both in the centre and province, to defuse the situation. A number of ministers had resigned following the motion submitted against Chief Minister Sanaullah Zehri.