To provide a detector with simple constitution capable of precisely grasping the weight of load, independently of the loading patterns of the load.

In the air suspension vehicle, having at least a suspension device of a rear axle constituted of an air spring, the air suspension vehicle is provided with a pressure sensor 1 outputting a signal, corresponding to the pressure of the air spring of the rear axle; a memory 3 storing the plurality of loading patterns on a bed; a calculation means 6 calculating the weight of load on the basis of the rear axle weight, calculated on the basis of the output signal of the pressure sensor and the loading pattern specified by an operator; and a display means 5 displaying the weight of load calculated by the calculation means 6, thereby predicting and detecting more accurate load amount and so forth, based on only the pressure of the air spring for suspending the rear axle.

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