To provide a method for inspecting a gas leakage, capable of inexpensively and accurately detecting gas leakages of a gas duct connected to a gas meter at a downstream side, in a short time.

The method for inspecting the gas leakage comprises the steps of opening a valve provided in the gas meter to fill the gas supplied from an upstream side of the meter into the gas duct the meter, closing the valve after a lapse of a sufficient first time interval for increasing the gas pressure in the duct to become larger than the predetermined value after the opening of the valve, monitoring the gas pressure by using a pressure switch for detecting, in accordance with whether or not the gas pressure is the predetermined value, and deciding the presence or the absence of gas leakage according to whether the gas pressure in the duct becomes the predetermined value or less or not until a second time interval has elapsed from the closure of the valve.