Cazeneuve, who has overseen the security forces' reaction to a string of jihadist attacks that have killed more than 230 people in France over the past two years, will take control of the Socialist government until legislative elections in June.
He was named prime minister after Valls presented his resignation to President Francois Hollande early today.
Hollande's office said Valls' resignation had been accepted.
"The President of the Republic has appointed Bernard Cazeneuve as prime minister and asked him to form the new government," the statement said.
In a combative speech, 54-year-old Valls vowed to take the fight to the conservative opposition and the far-right National Front, who are both leading the Socialists in election polls.
His announcement came four days after Hollande said he would bow out after a single term, paving the way for Valls to try to become the left's new standard bearer.
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