Rotary connector with locking mechanism for preventing rotation of housing prior to installation onto steering device

A rotary connector capable of preventing a locking key from projecting from a housing and eliminating dead space between the rotary connector and other vehicle-mounted parts. The rotary connector has a locking mechanism for a movable housing and a stationary housing, which is constituted of a guide hole bored in the movable housing, an operating part slidably stored in the guide hole, a part of which is projected from one open end of the guide hole to the outside, a locking key slidably stored in the guide hole, a part of which is projected from the other open end to the outside, a rotor snap (stopper) disposed opposite to the locking key, a first spring member set between the operating part and the locking key, a second spring member set between the locking key and the rotor snap, and a key engaging part provided on the stationary housing.