To provide an electrical connection box capable of reducing the types of cases, suppressing the rise of unit price of substrates, reducing manufacturing cost, and achieving higher efficiency of assembly.

In an electrical connection box, at lower part of height direction of both sid surfaces of width direction of accommodating space of a case 3, a pair of first guides 3a extending in substantially U shape in cross-section and in side surface direction (depth direction of accommodating space) are integrally formed. At upper part of its height direction, a pair of second guides 3b extending in substantially U shape in cross-section and in side surface direction are integrally formed. The pair of first guides 3a are formed at wide spacing in width direction so that a first circuit substrate 2a with a large size and wider width is inserted, and matingly retained. The pair of second guides 3b are formed at relatively narrower spacing in width direction than the first guides 3a so that a second circuit substrate 2b with a smaller size and narrower width than the first circuit substrate 2a is inserted, and matingly retained.

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