PURPOSE: To prevent the generation of a weighing error, by removing the floor vibration noise of a scale cell by a digital circuit.

CONSTITUTION: When a scale cell is not loaded, all of switches SW1WSW4 are turned OFF and, every when a definite wt. increases, said switches SW1, SW2,... are successively closed. That is, the amplifying ratio of the output signal of a dummy cell DC is changed corresponding to the wt. of an article to be weighed and the floor vibration noise of the dummy cell DC almost equal to the floor vibration component of the scale cell SC is obtained at a d-point. The output signal of the scale cell SC and that of the adjusted dummy cell DC are inputted to an adder ADD3 in a reverse phase and an output signal Vout, from which the floor vibration noise contained in the output signal of the scale cell SC was removed, is obtained.