It was the employee of a catering company who made the discovery last November: a camera was hidden in the toilets of a private hospital in Plérin (Côtes-d'Armor).
She lodged a complaint, triggering a police investigation.
On Tuesday, a 32-year-old storekeeper, an employee of the same catering company, was arrested and taken into police custody.
To read also "Complex", he hides a camera in the toilets of the men
In front of the police, the man admitted to having installed the camera and must appear soon before the court of Saint-Brieuc, indicates Ouest-France.
Six other women filed a complaint.
These toilets are only accessible to employees of the catering company working in the hospital establishment, but not to the public.