Patent ID: 8389874

Claim:
An electric connection box comprising: a casing; and a circuit component housed in the casing; wherein the circuit component includes plural bus bars arranged at intervals and a synthetic resin material arranged among the plural bus bars adjacent to one another and closely attached to the bus bars, thermal conductivity of the synthetic resin material being greater than that of air; and a bottom wall and sidewalls vertically provided from an outer peripheral edge of the bottom wall, wherein the bottom wall has a first surface on a side on which the sidewalls are vertically provided; an exposing section that is provided on the first surface, the exposing section exposes one of the bus bars from the synthetic resin material; an electronic component that is connected to the bus bar exposed from the exposing section; a second surface on an opposite side of the first surface; and a heat equalizing layer that is provided on the second surface of the bottom wall, continues to the synthetic resin material, covers the bus bars, and disperses heat generated from the bus bars.