Abstract: A methane cracking apparatus includes a supply pipeline that supplies a gas, a reactor having an interior space, and in which a catalyst for decomposing the gas may be disposed in the interior space, an agitator provided in the interior space and that agitates a material in the interior space, a first discharge pipeline connected to the reactor and that discharges decomposition materials generated as the gas may be decomposed, and a second discharge pipeline connected to the reactor, that discharges the decomposition materials, and disposed on an upper side of the first discharge pipeline.