Provided is an electric junction box which prevents highly-pressured water invading into a case from blowing to components in the case. The electric junction box includes a case including a frame to which a plurality of components is to be attached, a lower cover arranged to be attached to the frame. The frame includes a first side wall. The lower cover includes a second side wall and a flange. An upper end of the second side wall is positioned inside the first side wall, and a lower end of the first side wall abuts onto the flange. An outer face of the second side wall above the flange includes a parallel face and a tapered face. The parallel face has a length of 3 mm or more, and the tapered face has a length of 3 mm or more.