New York City Public Advocate Bill de Blasio has announced he’s running for mayor.

The public advocate announced his run Sunday outside his home in Brooklyn’s Park Slope.

The Democrat’s slogan is: “We only succeed if we leave no New Yorker behind.”

The 51-year-old candidate says that means he’ll conduct what he calls a “true citywide campaign” — starting Monday in all five boroughs.

The election to replace outgoing Mayor Michael Bloomberg is in November.

De Blasio says the billionaire mayor’s policies have been good for some, but many middle-class New Yorkers “have been ignored or priced out.”

The field of candidates includes City Council Speaker Christine Quinn and Bill Thompson, a former city comptroller — both Democrats — and Republican Joe Lhota, former chairman of the Metropolitan Transportation Authority.