A connector unit which prevents a user from contacting a first terminal fitting when fitting a first connector and a second connector together is provided. A connector unit 20 includes a first connector 1 having a first housing 4 receiving a first terminal fitting 3 and a contact-preventive housing 51 disposed between the first terminal fitting and the first housing, and a second housing to be fitted to the first housing. The contact-preventive housing includes a tension spring 6 having one end fixed at an outer circumference of the contact-preventive housing and the other end being a free-end arranged to engage to the first housing to restrict the contact-preventive housing from sliding. The second housing includes an entering portion 12 which enters between the tension spring and the first housing and pushes the tension spring to disengage the tension spring to permit the contact-preventive housing to slide.