The present invention relates to a method of fabricating a convex type of ultrasonic probe in which a plurality of piezoelectric elements are arrayed on a backing material in an arc shape in a long axis thereof, an acoustic adjustment layer is provided on top of the piezoelectric element and resin is molded on two side surfaces along the long-axis direction, and an acoustic lens is attached over the acoustic adjustment layer with a chemical-resistant film therebetween, wherein the acoustic lens is attached after the chemical-resistant film has been affixed to cover the surface of the acoustic adjustment layer and at least two edge surfaces of the acoustic adjustment layer, the piezoelectric elements, and the backing material that are exposed in the long-axis direction.