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This paper reports on an air pressure sensor for the measurement of the aerodynamic force on an insect wing. A piezoresistive cantilever was fabricated as a pressure sensor. The size of the cantilever was 250 mum times 200 mum times 0.3 mum. The sensitivity to air pressure was 0.29 times 10-3 Pa-1 below 2.0 kHz. By attaching the sensors on the prototype of an insect wing, pressure distribution over the surface were measured when the flow was both steady and unsteady.