Sliding component

A sliding component comprising a pair of sliding parts sliding relatively to each other, one of the sliding parts being a stationary-side seal ring, the other of the sliding parts being a rotating-side seal ring, the seal rings having sliding faces formed radially for sealing a liquid or a misty fluid as a sealed fluid against leakage, characterized in that at least one of the sliding faces is provided with:

• positive pressure generation mechanisms having positive pressure generation grooves configured to communicate with a circumferential edge of the sliding face on a sealed-fluid side and not to communicate with a circumferential edge on a leakage side, each positive pressure generation mechanism being constituted by:
• a radius-direction deep groove communicating with the circumferential edge on the sealed-fluid side, and
• each positive pressure generation groove having one end communicating with the radius-direction deep groove and another end having a Rayleigh step, and
• discharge grooves disposed, without communicating with the positive pressure generation grooves, at an angle with reference to a mating sliding face rotational direction as viewed in a direction of a rotational axis, said mating sliding face rotational direction being a rotational direction of a mating sliding face of the pair of sliding parts rotating relatively to the sliding face, wherein each discharge groove has an upstream end and a downstream end with respect to the mating sliding face rotational direction such that the upstream end of each discharge groove is located on the leakage side of the sliding face, and the downstream end of each discharge groove is located on the sealed-fluid edge side of the sliding face, wherein each discharge groove is an outer peripheral discharge groove type wherein, among the upstream end and the downstream end of each discharge groove,
• a first end located on a radially inner circumferential edge side of the sliding face communicates neither with a radially outer circumferential edge nor with the radially inner circumferential edge of the sliding face, and
• a second end located on the radially outer circumferential edge side of the sliding face communicates with the radially outer circumferential edge.