An electrical connection box includes a box main body; internal circuits that are arranged and accommodated in the box main body; and a terminal fastening portion that is arranged and accommodated in the box main body, and that is provided with a first fastening tool, the electrical connection box having a plurality of connection terminal portions that are provided to the internal circuits arranged on a first seating surface of the first fastening tool, and also having the plurality of connection terminal portions fastened and fixed together with a connection terminal that is crimped to an end of an external wire, in which the plurality of connection terminal portions each include a plurality of divided terminal portions that are formed to a size that partially covers the first seating surface of the first fastening tool and do not overlap each other in an axis direction of the first fastening tool.