Exhaust air from an electric-powered battery cooling fan which draws in an exhaust airflow from a battery for traveling purpose is diffused in a direction to a ventilating opening provided in a first cross member, as shown by an arrow C (10), an arrow C (11), and an arrow C (12), in a direction to a first ventilating opening provided in a cushioning material and a first ventilating duct provided in a cushioning material, as shown by an arrow C (20), an arrow C (21), an arrow C (22), and an arrow C (23), and in a direction to a second ventilating opening provided in the cushioning material and a second ventilating duct provided in the cushioning material, as shown by an arrow C (30), an arrow C (31), an arrow C (32), and an arrow C (33). With such a configuration, a local temperature rise in a vehicle interior is avoided even though the exhaust airflow flows from the battery for traveling purpose, without the need of a large space.

 
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