Joint connector, connector-equipped wire, and connector case

A joint connector formed by stacking connector cases each accommodating a connection terminal, wherein

• the connector cases each comprise:
• a main plate part configured to hold the connection terminal, and
• a pair of side plate parts perpendicular to the main plate part and parallel to each other,
• an inner-side surface of a distal end portion of each of the pair of side plate parts is provided with an engaging claw protruding in a direction toward an opposing side plate part of the pair of side plate parts or an engaging groove recessed in a direction away from the opposing side plate part,
• an outer-side surface of a proximal end portion of each of the pair of side plate parts is provided with an engaging groove recessed in a direction toward the opposing side plate part or an engaging claw protruding in a direction away from the opposing side plate part, and
• the connector cases are stacked with the engaging claws of one of the connector cases and the engaging grooves of another of the connector cases engaged with each other, respectively.