ELECTRICAL CONNECTION BOX

An electrical connection box for installation in a vehicle includes a bus bar to electrically and thermally interconnect a plurality of electrical components electrically connected to a power storage device or in-vehicle load installed in the vehicle, a casing to house the plurality of electrical components and the bus bar, and an insulating heat dissipation member thermally connected to the bus bar and the casing, with at least two of the plurality of electrical components being disposed adjacent to each other, and the bus bar dissipating heat from the two electrical components via the heat dissipation member.