(57) [summary] [purpose] is to reduce the air resistance caused by the mud guard at the time of high-speed driving to reduce fuel consumption. [Configuration] A air cylinder 3 is attached is fixed to the vehicle body 1, the distal end portion of a rod 3a of the air cylinder 3 is mud guard 4 is supported. Also, the air cylinder 3, and is connected to the compressor 7 being controlled CPU11. On the other hand, CPU11 is, have been connected to the wiper switch 12 and speedometer 13, by a signal from the wiper switch 12 and speedometer 13, it operates the air cylinder 3.
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