Mayor Bloomberg made a last-minute appointment for chair of the city’s Campaign Finance Board Monday, naming current Department of Investigations Commissioner Rose Gill Hearn to head the agency.

He announced the appointment for the fixed five-year term as Bill de Blasio prepared to take the oath of office.

“The mayor-elect looks forward to working with Rose Gill Hearn,” said Phil Walzak, a spokesman for de Blasio’s transition team.