His father Bashir Bilour, one of the ANP's top leaders, was also killed by a suicide bomber in 2012.
The bodies and injured were taken to Lady Reading hospital and CMH Peshawar. Tuesday's attack killed his son Haroon Bilour, a candidate for the provincial assembly.
The police officer did not confirm the nature of the blast, however, a local ANP leader while talking to DawnNewsTV said that a suicide bomber blew himself when Bilour entered the compound where the meeting was being held.
Rescuers and police teams rushed to the site and shifted the injured to nearby hospitals.
The deceased ANP candidate, who was set to contest the July 25 elections from Peshawar's PK-78 constituency, will be buried in Wazir Bagh at 5pm today (Wednesday).
Bomb disposal squad chief Shafqat Malik said eight kilos of TNT explosive was used in the blast.
The ANP was the main target of Taliban attacks in the 2013 election.
On the other hand, ANP leader Mian Iftikhar Hussain said the government had failed to provide security to the party.
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They have often been claimed by the Pakistani Taliban and their allies.
There was no immediate claim of responsibility for Tuesday's attack.
The National Counter Terrorism Authority on Monday had told a Senate standing committee that some leading political leaders faced death threats from militant outfits ahead of the 25 July general elections in Pakistan.
Meanwhile, Pakistan's Chief Election Commissioner (CEC) Sardar Muhammad Raza strongly condemned the attack, reports said.
More than 380,000 personnel will be deployed for the elections, according to Major General Asif Ghafoor, the military spokesman.
Last month, a USA drone strike killed the Pakistani Taliban chief Mullah Fazlullah, who had claimed responsibility for most of the attacks against the ANP in the 2013 election on the grounds that it had supported military operations against the militants.
"Six people include Pakistan Tehreek-i-Insaf chairman Imran Khan, Awami National Party leaders Asfandyar Wali and Ameer Haider Hoti, Qaumi Watan Party head Aftab Sherpao, Jamiat Ulema-i-Islam-Fazl leader Akram Khan Durrani and Hafiz Saeed's son Talha Saeed".