Electrical connection box

An electrical connection box for a vehicle, including an insertion housing that has a rectangular open port on one side and in which a plurality of rectangular insertion holes into which fuses are to be respectively inserted are provided facing the open port, the electrical connection box comprising:

• a substrate arranged opposing one wall portion surrounding the open port is included outside of the insertion housing;
• a first insertion hole row in which a plurality of the insertion holes are provided side by side in a lengthwise direction of the open port, with long sides of the insertion holes adjacent to each other;
• and
• a second insertion hole row in which a plurality of the insertion holes are provided side by side in the lengthwise direction of the open port, with short sides of the insertion holes adjacent to each other, wherein the first insertion hole row is provided at a position close to the substrate and the second insertion hole row is provided at a position far from the substrate.