NOVELTY - The structure has a battery exhaust duct (58) whose one end is connected with battery cooling air discharge port while other end is connected with draft opening (3a). The end of charger exhaust duct (61) is connected with charger cooling air discharge port (37b) of charger (37) while other end is connected with charger duct connection opening (58d). The end of converter exhaust duct (59) is connected with converter cooling air discharge port (35c) of converter (35) while other end is connected with converter duct connection opening (61e).    USE - Cooling air exhaust duct structure of electric vehicle such as front-engine front-wheel (FF) plug-in hybrid vehicle. Can also be used in hybrid vehicle without plug-in structure.    ADVANTAGE - Since the end of converter exhaust duct is connected with converter cooling air discharge port of converter while other end is connected with converter duct connection opening, the exhaust duct for batteries, exhaust duct for chargers, and the exhaust duct for converters can be connected with the exhaust duct adjacent to vehicle downward position in order while positioning charger and converter in order to vehicle up-down direction with respect to the battery for driving. The exhaust duct can be arranged in lamination state to vehicle up-down direction when sharing the exhaust route into which cooling air flows so that the shortening of the duct length of exhaust duct can be attained and space required for routing of exhaust duct can be made compact. The compactization of the unit assembly by which charger and converter are arranged in the vicinity of the battery for driving can be attained. Since the cooling air from battery cooling fan with air flow volume is directly exhausted through the exhaust duct for batteries to draft opening, the flow is not overdue. The smooth exhaustion of the cooling air from battery cooling fan can be achieved.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of battery type element arrangement structure within rear room in FF plug-in hybrid vehicle. (Drawing includes non-English language text)    Draft opening (3a)    Converter (35)    Converter cooling air discharge port (35c)    Charger (37)    Charger cooling air discharge port (37b)    Battery exhaust duct (58)    Charger duct connection opening (58d)    Converter exhaust duct (59)    Charger exhaust duct (61)    Converter duct connection opening (61e)