US Patent 10232810 Electrical connection box

Provided is an electrical connection box including a new structure, according to which, even in the case of using a component holding case in which terminal holding portions and electrical component mounting portions are integrated, engagement between connection terminal portions and supporting pins in a lateral component connection portion can be checked easily, and improvements in the workability and reliability of assembly and an improvement in work efficiency due to a reduction in the number of components can be achieved simultaneously. Through windows are provided in an upper wall portion of a component holding case so as to penetrate through positions opposing supporting pins arranged inside in a vertical direction.