Electronic component unit and electrical connection box

An electrical connection box comprising:

• a housing;
• and
• an electronic component unit that is accommodated in a housing inner space portion of the housing, wherein
• the electronic component unit includes
• an accommodation member having a first opening and a second opening that communicate an accommodation space portion of the electronic component unit,
• a plurality of electronic components that are accommodated in the accommodation space portion by being inserted into the accommodation space portion from the second opening, and
• a bus bar in a planar shape that is accommodated in the accommodation space portion by being inserted into the accommodation space portion from the first opening, and that includes a rectangular unit,
• the accommodation member includes a dividing wall that couples inner wall surfaces facing each other in a peripheral wall for forming the accommodation space portion, in the accommodation space portion, and that forms divided space portions by dividing the accommodation space portion,
• the dividing wall is provided with a slit that extends from an end of the first opening side toward the second opening, and that communicates the adjacent divided space portions,
• the rectangular unit of the bus bar is exposed to inside of each of the divided space portions, when the rectangular unit is held by being inserted into the slit, and
• the electronic components are individually accommodated in the respective divided space portions, and are connected to the rectangular unit being exposed.