Patent ID: 8701475

Claim:
An air flow measuring device that is adapted to be disposed in an intake passage through which intake air drawn into an internal combustion engine flows and that is configured to measure a flow rate of intake air flowing through the intake passage, the device comprising: a housing that defines a bypass flow passage through which intake air passes, wherein a part of intake air is taken into the bypass flow passage to pass through the bypass flow passage; a flow sensor that includes a sensing part disposed in the bypass flow passage and that is configured to produce a signal which is in accordance with the flow rate of intake air as a result of heat transfer between intake air taken into the bypass flow passage and the sensing part; and a humidity sensor that includes a sensing part exposed to the intake passage and that projects from an outer wall of the housing into the intake passage, the humidity sensor configured to produce a signal which is in accordance with humidity of intake air flowing through the intake passage, wherein at time of resin-formation of the housing, the humidity sensor is resin-molded to be integrated into the housing.