FLOW RATE MEASUREMENT DEVICE

Gas meter (100) that is a flow rate measurement device includes flow rate measurement unit (104) for measuring, at a constant time interval, a flow rate of gas flowing in a passage, pressure measurement unit (132) for measuring pressure of the gas in the passage, power supply unit (134) for supplying power to pressure measurement unit (132), and appliance determination unit (116) for determining an appliance being used based on a gas flow rate value. Gas meter (100) further includes measurement interval controller (138) for determining a gas non-use state, an appliance determination performing state, or an appliance determination non-performing state based on the gas flow rate value and operation information of appliance determination unit (116), for controlling power supply unit (134) in accordance with the determined state, and for changing an interval for turning on/off power supplied to pressure measurement unit (132).