The former minister’s loss came a day after his son, Ibrahim Obanikoro (APC, Eti Osa), lost the ticket for a return to the House of Representatives.
The News Agency of Nigeria (NAN) reports that Mrs Adebule defeated Mr Obanikoro with 424 votes against 119.
Kayode Opeifa, a former commissioner in the state, polled four votes.
Emeka Okafor, APC Electoral Returning Officer who announced the result, said Mrs Adebule emerged the Lagos West APC Senatorial candidate for the 2023 general elections.
According to him, Adebule polled 424 votes, Obanikoro -119 votes, and Opeifa four votes.
“We have 557 total votes cast, with 10 invalid votes.
“I hereby declare Dr Idiat Adebule winner of APC Lagos West Senatorial Primary election,” he said.
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Mrs Adebule in her acceptance speech thanked the party leaders and delegates for their support toward her victory.
The former deputy governor urged the electorate to give their full support to the party in the 2023 general elections.
She assured the constituents of proper and good representation at the National Assembly.
Mr Obanikoro, however, walked out of the election venue before the end of the counting exercise and declined comments.