To provide an apparatus for measuring the flow rate of a slurry, capable of easy handling and measuring the flow rate of a solid in the slurry, at a low cost.

The apparatus for measuring the flow rate of the slurry comprises a measuring tube in which the slurry flows. The apparatus comprises a volume flowmeter, provided in the tube to measure a volume flow rate, a weight flowmeter provided in the tube to measure a weight flow rate, and an arithmetic unit for calculating the solid weight flow rate from a volume flow rate measured value of the volume flow rate and weight flow rate measured value of the weight flowmeter.