Abstract: Fixed part 21 of a shield panel 20 is fixed to a casing 1 in vicinity of a lower edge of an opening 15. In the shield panel 20, a portion of step part 22 adjoining the fixed part 21, flat part 23 and bent part 24 are placed inside the casing 1. Extremity of the bent part 24 is in contact with an inner side surface of the casing 1 in vicinity of an upper end of the opening 15. Thus invasion of flame into the casing 1 through the upper end of the opening 15 is prevented. Besides, gaps as air circulation paths that are formed between side edges of the opening 15 and the flat part 23 of the shield panel 20 provide ventilation in the casing 1 and improve efficiency of cooling electrical components in an electrical component box 10.

Abstract: Fixed part 21 of a shield panel 20 is fixed to a casing 1 in vicinity of a lower edge of an opening 15. In the shield panel 20, a portion of step part 22 adjoining the fixed part 21, flat part 23 and bent part 24 are placed inside the casing 1. Extremity of the bent part 24 is in contact with an inner side surface of the casing 1 in vicinity of an upper end of the opening 15. Thus invasion of flame into the casing 1 through the upper end of the opening 15 is prevented. Besides, gaps as air circulation paths that are formed between side edges of the opening 15 and the flat part 23 of the shield panel 20 provide ventilation in the casing 1 and improve efficiency of cooling electrical components in an electrical component box 10.