In an electric connection box containing a wiring board such as a bus bar circuit board and a surface cover set on the top of the wiring board and assembled inside the box body, the inside bottom surface of the box body is inclined to an angle that allows the downward flow of water droplets, spacers are projectingly installed upwardly on the inclined surface, and a spacing provided between the bus bar circuit formed in the lower surface of the wiring board in contact with the spacers and the inside bottom surface of the box body is greater than the height of the water droplets.