John Michael Wronski of Cary was arrested Friday morning.
According to an arrest warrant, the 40-year-old put the camera inside the woman's bathroom at Papa Murphy's Pizza Place in Cary.
It also said the camera was in the bathroom while two unidentified victims were inside.
Officials said Wronski is a former employee of the restaurant, and the incidents happened last summer.
Wronski has been charged with secret peeping and has been placed under a $3,000 bond.