Module having a handle to be operated to attach the module to a cage

A module configured to be attachable to and detachable from a cage, comprising:

• an engagement pin that engages the module with the cage by being inserted into an engagement aperture provided to the cage in a state where the module is attached to the cage;
• a tongue piece connected to the engagement pin and displaceable in a direction in which the engagement pin is disengaged from the engagement aperture;
• and
• a handle configured to limit a displacement of the tongue piece in a state where the module is attached to the cage and cancel the limitation of the tongue piece by rotating about a rotation shaft, the handle having a cam structure provided in a vicinity of the rotation shaft so as to urge the tongue piece, the handle being capable of urging the tongue piece until an engagement between the cage and the module due to an insertion of the engagement pin into the engagement aperture is cancelled.