Patent ID: 8383963

Claim:
An electrical junction box having an upper surface and a plurality of electrical component mounting sections provided on the upper surface, the electrical junction box comprising: peripheral walls defining a plurality of electrical component mounting section units having end edges and outer peripheral surfaces, the plurality of electrical component mounting section units being: i) arranged in a straight line, ii) separated apart from one another, and iii) arranged in parallel with one another; and a heat radiation drainage groove provided between opposed portions of the peripheral walls, said heat radiation drainage groove: i) having an end opening that extends to the end edges of said plurality of electrical component mounting section units, and ii) being exposed by the outer peripheral surfaces of said plurality of electrical component mounting section units, wherein the heat radiation drainage groove includes a groove bottom surface that is lowest at a side of the end opening of the heat radiation drainage groove, the plurality of electrical component mounting sections each include a cavity with bottom walls, the plurality of electrical component mounting sections are consolidated and arranged in each of the plurality of electrical component mounting section units in a longitudinal direction of each unit in accordance with a depth of the cavity in each electrical component mounting section, the peripheral walls have projecting heights that protrude from the bottom walls of said cavities and the projecting heights are different in the longitudinal direction of the plurality of electrical component mounting section units, a height of the groove bottom surface is different based on a change of the projecting heights of the peripheral walls, a height of a groove bottom surface connected with a higher peripheral wall is higher than a height of other groove bottom surfaces connected with shorter peripheral walls, and the groove bottom surface of the lowest height is provided at the side of the end opening.