Housing, electrical connection box and wire harness

A housing comprising:

• a frame having a frame peripheral wall which forms a lower opening, wherein the frame peripheral wall has a frame side seam formed at a lower opening side of the frame peripheral wall;
• and a lower cover having a cover side seam which is engaged with the frame side seam, and configured to cover the lower opening, wherein the lower cover has a first shield wall protruding outward from the cover side seam, and a second shield wall protruding longer than the first shield wall from the first shield wall toward an upper side of the frame;
• wherein the second shield wall is located outward than a mating surface between the frame side seam and the cover side seam, a base portion of the second shield wall is connected to the first shield wall, a wall inner surface of the second shield wall is formed to face an outer surface of the frame peripheral wall, and an entire of the second shield wall from its distal end portion to the base portion is located outward than and spaced away from the outer surface of the frame peripheral wall;
• and wherein a groove-shaped or pocket-shaped moisture removal space is formed between the mating surface and the first shield wall;
• wherein the first shield wall has an inclined surface inclined towards a drain portion;
• and a reinforcement rib formed on the inner wall surface of the second shield wall extending in an upper-lower direction at a central position of the wall inner surface.