A former NYPD officer copped Friday to embezzling more than $400,000 while serving in a leadership position at Municipal Credit Union.

Joseph Guagliardo told Manhattan federal Judge Denise Cote that between 2009 and 2018, he funneled MCU monies into his own businesses — including overpaying a sham security service to check on MCU ATMs.

The 62-year-old also admitted to overbilling the nonprofit bank for web advertisements.

“These agreements were with the CEO, and I believed them to be correct,” Guagliardo said Friday, referencing former MCU CEO Kam Wong, who is serving time for embezzling $10 million from the credit union.

The former cop was arrested alongside Brooklyn Supreme Court Judge Sylvia Ash, who once served on MCU’s board of directors and is facing obstruction of justice charges for deleting text messages and emails relating to the investigation.

Guagliardo is slated to be sentenced April 10 and faces up to 30 years behind bars.

Ash’s case is still pending.