The present invention provides an air flow measuring device comprising a housing (2) with a sub-passage (7) having a inlet (9) and a outlet (10) for air flow formed in the housing (2), the sub-passage (7) further having a predefined curvature with a maximum downstream point (8a) and a flow measuring element (3) located in the sub-passage (7) at a position at least further downstream from the point (8a).
