Abstract: A sensor buffer cover is provided that is easily held at a fixed position without pain or discomfort to a patient to enable high-definition imaging. It is a sensor buffer cover wherein a cover body constituted as a flexible bag body into which a sensor unit is inserted comprises an inner bag-like sheet made of resin and formed in a rectangular shape to have an opening at one end in the longitudinal direction and an outer sheath member at the base of the inner bag-like sheet constituted as a flexible bag body formed in approximately the same shape as the sensor unit, which covers the periphery of the sensor unit inserted therein and is open at one end in the longitudinal direction, the outer peripheral edge of the base of the inner bag-like sheet and the outer peripheral edge of the outer sheath member covering the base of the inner bag-like sheet being fusion-bonded on three sides to leave an opening and obtain a double bag-like structure.