A pair of sliding parts (3, 5) in which a plurality of dimples is provided independently from each other in the circumferential direction on one of sealing faces that relatively slide on each other, wherein: each of the dimples is formed along the circumferential direction with substantially fixed width from a cavitation formation region on an upstream side of each of the dimples to a positive pressure generation region on a downstream side of each of the dimples, an upstream beginning end of the cavitation formation region is formed in a tapered shape inclined with respect to a rotating direction of the opposing sealing face from a low pressure fluid side toward a high pressure fluid side, and disposed so as to overlap a positive pressure generation region of the dimple arranged on the upstream side in a radial direction, and a low pressure fluid side edge of the positive pressure generation region is formed in a tapered shape inclined with respect to the rotating direction of the opposing sealing face from the low pressure fluid side toward the high pressure fluid side and smoothly connected to a low pressure fluid side edge of the cavitation formation region, characterized in that positive pressure generation mechanisms formed from Rayleigh steps communicating with the high pressure fluid side via radial grooves are disposed on the high pressure fluid side on the sealing face in which the dimples are provided or the high pressure fluid side on the other sealing face, the dimples being disposed on the low pressure fluid side on the sealing face, a pressure release groove is provided between the positive pressure generation mechanisms and the dimples, and the pressure release groove communicates with the high pressure fluid side via the radial groove, and wherein each of the Raleigh steps is formed from a narrowing step and a groove section in addition to the radial groove, the groove section being disposed so as to be isolated from the high pressure fluid side by a sealing face with fixed width, extending in the circumferential direction with fixed width so as to form an arc shape. each of the dimples is formed along the circumferential direction with substantially fixed width from a cavitation formation region on an upstream side of each of the dimples to a positive pressure generation region on a downstream side of each of the dimples, an upstream beginning end of the cavitation formation region is formed in a tapered shape inclined with respect to a rotating direction of the opposing sealing face from a low pressure fluid side toward a high pressure fluid side, and disposed so as to overlap a positive pressure generation region of the dimple arranged on the upstream side in a radial direction, and a low pressure fluid side edge of the positive pressure generation region is formed in a tapered shape inclined with respect to the rotating direction of the opposing sealing face from the low pressure fluid side toward the high pressure fluid side and smoothly connected to a low pressure fluid side edge of the cavitation formation region, characterized in that positive pressure generation mechanisms formed from Rayleigh steps communicating with the high pressure fluid side via radial grooves are disposed on the high pressure fluid side on the sealing face in which the dimples are provided or the high pressure fluid side on the other sealing face, the dimples being disposed on the low pressure fluid side on the sealing face, a pressure release groove is provided between the positive pressure generation mechanisms and the dimples, and the pressure release groove communicates with the high pressure fluid side via the radial groove, and wherein each of the Raleigh steps is formed from a narrowing step and a groove section in addition to the radial groove, the groove section being disposed so as to be isolated from the high pressure fluid side by a sealing face with fixed width, extending in the circumferential direction with fixed width so as to form an arc shape.