To prevent a resin honeycomb from being erroneously assembled in respect of surface and back in assembling a main air passage component and the resin honeycomb.

This resin honeycomb is so constructed that the shape of a part mounted and fixed to the main air passage component is asymmetrical, or the intervals of three or more bonding fixed parts are set to be unequal in three or more intervals, whereby the resin honeycomb is constructed.to be assembled only in one direction so that the resin honeycomb can be prevented from being erroneously assembled in respect of surface and back. Though a worker has to pay attention to the direction of insertion to prevent the resin honeycomb from being erroneously inserted in respect of surface and back in the case of the conventional resin honeycomb, according to the invention, the resin honeycomb is so constructed that if the surface and back are reversed, the honeycomb can not be assembled. Accordingly, erroneous assembling can be prevented. Thus, it is possible to provide a heating resistor type air flow measuring apparatus capable of holding down variation in characteristics in erroneously taking the surface for the back and having stable characteristics without variation.