Electrical junction box

An electrical junction box, comprising:

• an insulating substrate that includes a first electroconductive path formed on an insulating plate;
• a bus bar that is bonded to the insulating substrate and forms a second electroconductive path;
• a reinforcement plate that is bonded to a region of the insulating substrate to which the bus bar is not bonded, the reinforcement plate having formed therein a through hole that allows passage of a shaft portion of a screw;
• a terminal that is soldered to the insulating substrate;
• a heat-dissipating member that is stacked on a surface of the reinforcement plate opposite to the insulating substrate, the heat-dissipating member having formed therein a screw hole into which the screw is screwed;
• and
• a retaining member that retains the respective positions of the insulating substrate, the bus bar, and the reinforcement plate, wherein:
• the reinforcement plate includes an engagement portion that aligns the through hole and the screw hole by engaging with the retaining member.