A flow measurement device comprising: a flow rate measurement unit configured to measure a flow rate of gas at a prescribed time interval, the gas flowing through a flow path; an arithmetic unit configured to calculate a difference value between a first flow rate value measured at a certain measurement timing and a second flow rate value measured at a measurement timing immediately prior to the certain measurement timing; a difference value conversion unit configured to calculate a flow rate ratio, based on the difference value; an appliance characteristic extraction unit configured to extract at least one appliance characteristic quantity indicating a characteristic of a flow rate change in a currently using gas appliance, and that extracts a value calculated from the first flow rate value and the second flow rate value as the at least one appliance characteristic quantity; an appliance inherent characteristic information holding unit configured to hold one or more appliance inherent characteristic quantities indicating a characteristic flow rate state of a specific gas appliance; and an appliance discrimination unit configured to discriminate the currently using gas appliance, based on a comparison between the appliance characteristic quantity extracted by the appliance characteristic extraction unit and the appliance inherent characteristic quantity corresponding to the appliance characteristic quantity out of the one or more appliance inherent characteristic quantities held by the appliance inherent characteristic information holding unit, wherein the appliance characteristic extraction unit is configured to extract the at least one appliance characteristic quantity in a case where the flow rate ratio falls within a reference range characterized in that a plurality of flow rate zones are set to correspond to the flow rate of the gas flowing through the flow path, and in that the reference range is determined in accordance with a flow rate zone to which the first flow rate value belongs, the flow rate zone being included in the plurality of flow rate zones. a flow rate measurement unit configured to measure a flow rate of gas at a prescribed time interval, the gas flowing through a flow path; an arithmetic unit configured to calculate a difference value between a first flow rate value measured at a certain measurement timing and a second flow rate value measured at a measurement timing immediately prior to the certain measurement timing; a difference value conversion unit configured to calculate a flow rate ratio, based on the difference value; an appliance characteristic extraction unit configured to extract at least one appliance characteristic quantity indicating a characteristic of a flow rate change in a currently using gas appliance, and that extracts a value calculated from the first flow rate value and the second flow rate value as the at least one appliance characteristic quantity; an appliance inherent characteristic information holding unit configured to hold one or more appliance inherent characteristic quantities indicating a characteristic flow rate state of a specific gas appliance; and an appliance discrimination unit configured to discriminate the currently using gas appliance, based on a comparison between the appliance characteristic quantity extracted by the appliance characteristic extraction unit and the appliance inherent characteristic quantity corresponding to the appliance characteristic quantity out of the one or more appliance inherent characteristic quantities held by the appliance inherent characteristic information holding unit, wherein the appliance characteristic extraction unit is configured to extract the at least one appliance characteristic quantity in a case where the flow rate ratio falls within a reference range characterized in that a plurality of flow rate zones are set to correspond to the flow rate of the gas flowing through the flow path, and in that the reference range is determined in accordance with a flow rate zone to which the first flow rate value belongs, the flow rate zone being included in the plurality of flow rate zones.