Electrical junction box

An electrical junction box includes a housing constituted by an upper case and a lower case that have different linear expansion coefficients from each other, a busbar fixed to the upper case being in contact with a gap filler adhered to an inner surface of the lower case, and the electrical junction box includes a plurality of connection members that are provided in a vicinity of the gap filler and connect an inner surface of the lower case and an inner surface of the upper case that faces the inner surface.