Electrical connection box and wire harness

A wire harness comprising:

• an insulating housing;
• a conductive relay bus bar held by the housing within the housing;
• an electronic component inserted to an accommodation completion position within the housing and provided with a conductive bus bar connected to the relay bus bar;
• a fixing structure that physically and electrically connects the bus bar at the accommodation completion position to the relay bus bar held by the housing;
• and
• an electrical wire electrically connected to the relay bus bar and the bus bar and pulled out from an inside of the housing, wherein
• the relay bus bar includes a plurality of electrical connection bodies and a coupling body coupling the electrical connection bodies,
• at least one of the electrical connection bodies is a flat electrical connection body, the flat electrical connection body has a plate shape with two flat surfaces that extend along an insertion direction of the electronic component with respect to the housing within the housing,
• the bus bar includes a flat electrical connection body, the flat electrical connection body of the bus bar has a plate shape with two flat surfaces that extend along the insertion direction,
• one of the two flat surfaces of the flat electrical connection body of the relay bus bar and one of the two flat surfaces of the flat electrical connection body of the bus bar are mating surfaces brought into physical contact with each other by the fixing structure,
• one of the flat electrical connection bodies of the relay bus bar and the bus bar is elastically deformed in a direction crossing the mating surfaces by a different one of the flat electrical connection bodies, which applies a reaction force to the different one of the flat electrical connection bodies, and
• the housing includes a receiving portion that receives, from the electronic component, the reaction force applied to the different one of the flat electrical connection bodies.