Air physical quantity sensor

An air physical quantity sensor for detecting a specific physical quantity related to air flowing in a flow passage, comprising:

• a sensor element configured to output a detection signal in accordance with the specific physical quantity;
• a sensor body having a body recess opening at a body opening and being configured to contain the sensor element in the body recess;
• a sensor substrate having a mounting surface on which a circuit element for processing the detection signal is mounted, the sensor substrate holding the sensor body on the mounting surface;
• a sensor cover having a cover window penetrating between the flow passage and the body opening, and being configured to cover the sensor body;
• a sensor filter interposed between the sensor body and the sensor cover, and being configured to filter the air flowing from the flow passage into the body recess through the body window and the body opening;
• and
• a potting resin body being hardened in a state of sealing the circuit element on the mounting surface, the potting resin body in which the sensor cover is embedded on the outer peripheral side of the sensor body.