An ultrasonic sensor includes a flexible substrate, an ultrasonic transceiver array, and a processing device. The ultrasonic transceiver array is disposed on the flexible substrate and includes a first piezoelectric material layer, a protection layer, and a conductive layer. The conductive layer is disposed between the first piezoelectric material layer and the protection layer, and a portion of the conductive layer extends onto the flexible substrate. The processing device is electrically connected to the conductive layer of the ultrasonic transceiver array.一種超音波感測器，包含撓性基板、超音波收發器陣列以及運算裝置。超音波收發器陣列設置於撓性基板上。超音波收發器陣列包含第一壓電材料層、保護層以及導電層。導電層位於第一壓電材料層與保護層之間，且導電層的一部分延伸至撓性基板上。運算裝置電性連接超音波收發器陣列的導電層。
