Disclosed is a flow rate measurement device that improves accuracy in identifying appliances, simplifies computations and reduces memory usage required for computations, and absorbs variations resulting from manual operation or ignition when the appliances are used either singly or in combination, by way of a configuration that extracts characteristics of the appliances. The device identifies gasappliances (13, 14, 15) by monitoring and evaluating the change in flow rate as measured by a flow rate measurement means (104), monitoring and evaluating the code that is acquired by a differential conversion means (112), extracting the characteristic appliance flow quantities that denote the characteristics of the gas appliances (13, 14, 15), and comparing the extracted characteristic applianceflow quantities with intrinsic characteristics of the appliances.