Distribution unit and electric connection box including the same

A distribution unit comprising:

• a heat radiation member having a circuit disposition face;
• a power circuit section including a plurality of bus bars disposed on the circuit disposition face;
• external connection terminals formed by folding up ends of the bus bars placed near to each other from the circuit disposition face;
• a surround wall member disposed on the heat radiation member so as to surround the power circuit section including the external connection terminals;
• a connector housing including a bottom having terminal through holes into which the external connection terminals are inserted and a hood surrounding the external connection terminals projected to the opposite side to the circuit disposition face through the terminal through holes, the connector housing and the external connection terminals making up an external connection connector being connectable to a different connector;
• and
• a water resistance layer;
• wherein at the bottom of the connector housing, an insulating projection rib intervening between the external connection terminals and having a tip against which the different connector is abutted is projected toward the tip side of the external connection terminals;
• and
• the water resistance layer is formed in a state in which at least a part of the power circuit section is sealed inside the surround wall member and the water resistance layer leads to the inside of the connector housing through the terminal through hole and the top face of the water resistance layer is set higher than the bottom of the connector housing and is set lower than the tip face of the projection rib.