Electrical connection box and connection terminal component

An electrical connection box comprising:

• a circuit portion that has a bus bar as a conduction path, an electronic component being mounted on the circuit portion;
• a case in which the circuit portion is housed;
• a substrate terminal portion that is provided on the bus bar, a through-hole being formed in the substrate terminal portion;
• an electrical wire terminal portion that is connected to an electrical wire, a through-hole being formed in the electrical wire terminal portion;
• a bolt that has a shaft portion that is inserted into the through-hole of the substrate terminal portion and the through-hole of the electrical wire terminal portion in a state where the substrate terminal portion and the electrical wire terminal portion are overlaid on each other;
• and
• a nut that is fastened to the bolt,
• wherein the electrical wire terminal portion or the substrate terminal portion has a contact portion that comes into contact with a seat surface of the bolt, and a surface on a seat surface side of the contact portion is recessed so as to have a reduced thickness dimension.