The formation of the party was for the purpose of the improvement of the livelihood and protect the rights of the Bumiputera in many sectors such as politics, social, sports, education, infrastructures, financial & monetary autonomy, science, and technology.

Parti Pesaka Anak Sarawak was formed in Sibu in August 1962 to cater for the Ibans of Batang Rajang.

Its promoters refused to join the Sarawak National Party, which they claimed only catered for Ibans from Saribas.

However, the person who actually mooted the idea of forming PESAKA was Thomas Kana, a former dresser at Kuala Belait.

Initially, both parties were willing to dissolve themselves in order to allow United Malays National Organisation to enter Sarawak.

Except for a few prominent dissenters, especially some of the former members of PANAS, the new party was supported by both the aristocrats and the young intelligentsia, the latter holding the more important posts in it.

But basically the formation of Parti Bumiputera was a final reconciliation between the two groups and it opened the way for a new era of Malay politics in Sarawak.

However, not a single party command a majority in Council Negri (now Sarawak State Legislative Assembly).

Abdul Rahman from Parti Bumiputera was able to convince SUPP to form a state government with him as the chief minister.

Ultimately another negotiation was held between PESAKA and Parti Bumiputera in September 1972 and both sides eventually agreed to a merger on 5 January 1973.

In this general assembly, Abang Abu Bakar and Salleh Jafaruddin (Rahman's nephew) from bumiputera wing were elected to the party's executive committee.

In September 1975, Abdul Rahman suddenly announced his retirement from politics due to criticisms to his administration of the Sarawak state.

However, Abdul Rahman remained as the executive member of PBB and the leader of Sarawak Barisan Nasional (BN).

Taib demanded his uncle Abdul Rahman to create another deputy president post for him by changing the party constitution.

[3] Rahman retired from politics on 26 March 1981 and his nephew Taib Mahmud succeeded him as the PBB president for the second time.