Emmerson Mnangagwa has vowed a "brighter tomorrow" for Zimbabwe after being sworn in as president.
He also announced an inquiry into the deaths of six people in clashes between the army and opposition supporters after the July vote. The violence was "unacceptable", he said.
The opposition MDC Alliance continues to reject the result despite a court ruling on Friday upholding it.
July's poll was the first since veteran leader Robert Mugabe was ousted.
MDC leader Nelson Chamisa says he was robbed of victory and did not attend Mr Mnangagwa's inauguration.
What did Mnangagwa say?
He again condemned the post-election violence, saying it "should be alien to our nature as Zimbabweans" and offering condolences to the victims' families.
Describing himself as a "listening president", he said his government was committed to constitutionalism, the rule of law and judicial independence.
"The Zimbabwe we want is a shared one and transcends party lines," he said.
Mr Mnangagwa - who from the Zanu-PF party of Mr Mugabe - also vowed radical economic reforms aimed at attracting foreign and domestic investment.
"The creation of jobs, jobs and more jobs will be at the core of our policies," he said.
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