Abstract: An air flow meter has a cylindrical housing to be coupled to an intake air conduit of a vehicle in a way that a main passage is formed within said housing. An egg-shaped member has a bypass passage formed therein is supported by a plurality of supporting members in a center of the main passage. A flow rate detecting resistance is provided in the bypass passage. There are two throttling portions formed within the cylindrical housing. A downstream throttling portion, which is provided near an outlet of the bypass passage, throttles a flow of air in the main passage near the outlet of the bypass passage so as to cause air in the main passage to be introduced into the inlet of bypass passage by a pressure difference caused thereby. An upstream throttling portion, which is provided upstream of the downstream throttling portion, throttles a flow of air in the main passage so that the flow of air in the main passage is equalized.