To reduce parts constitutions of a vehicle height adjusting device of an air suspension vehicle and surely hold set pressure.

This device adjusts a vehicle height by increasing/decreasing air pressure of an air cylinder or an air bag interposed between an axle and a vehicle body. In the device, the air pressure of the air cylinder or the air bag can be adjusted to be increased/decreased by a manual operation in a vehicle stopping mode, and the air pressure of the air cylinder or the air bag is held to prescribed pressure by invalidating the manual operation in a traveling mode. The device is provided with solenoid valve and regulator in a pneumatic line for connecting a pneumatic source to supply compressed air to the air cylinder or the air bag. When the vehicle stopping mode is switched to the traveling mode, the solenoid valve is released for fixed time.