A gas measuring apparatus for a secondary battery comprises: a chamber accommodating a secondary battery therein; a heater unit applying heat to the chamber to ignite the secondary battery accommodated in the chamber; a collection tube connected to the inside of the chamber to collect a gas generated in the secondary battery; a vacuum unit connected to the collection tube to vacuumize the inside of the chamber so as to introduce the gas into the collection tube; and a gas measuring unit measuring an amount of gas introduced into the collection tube.