A connector cage that makes a spring member difficult to be broken when a mating connector is fitted. The connector cage includes a cage body that has a reception portion for receiving a mating connector therein, a partition member that partitions the reception portion in a left-right direction of the cage body, and a spring member that is arranged at a front end of the partition member in a front-rear direction, and is brought into contact with the mating connector. A first hole is formed which is a through hole extending through the cage body in an up-down direction. The spring member includes a spring member-side protruding portion which is inserted through the first hole, and is connected to the cage body.