A sliding component comprising: a pair of sliding parts of which a rotating-side sliding part is rotatable in both forward and reverse directions, wherein at least one of the sliding parts has a sliding face (S) including positive pressure generation grooves located on a sealed fluid side, a negative pressure generation groove located on an opposite-to-sealed-fluid side and separated from an opposite-to-sealed-fluid side by a land (R), and a deep groove communicating with a sealed fluid side on the sealed fluid side of the negative pressure generation groove , the deep groove includes a radial deep groove and a circumferential deep groove , the circumferential deep groove extending continuously in a circumferential direction through the radial deep groove , the positive pressure generation grooves each have an upstream end communicating with the radial deep groove , and the circumferential deep groove is arranged in a radial space between the positive pressure generation grooves and the negative pressure generation groove , characterized in that the negative pressure generation groove has an upstream inlet portion , a downstream outlet portion , an intermediate portion between the inlet portion and the outlet portion , a first connection connecting the upstream inlet portion to the circumferential deep groove , and a second connection connecting the downstream outlet portion to the circumferential deep groove , and the upstream inlet portion and the downstream outlet portion each communicate with the sealed fluid side via the first and second connections, the circumferential deep groove , and the radial deep groove . a pair of sliding parts of which a rotating-side sliding part is rotatable in both forward and reverse directions, wherein at least one of the sliding parts has a sliding face (S) including positive pressure generation grooves located on a sealed fluid side, a negative pressure generation groove located on an opposite-to-sealed-fluid side and separated from an opposite-to-sealed-fluid side by a land (R), and a deep groove communicating with a sealed fluid side on the sealed fluid side of the negative pressure generation groove , the deep groove includes a radial deep groove and a circumferential deep groove , the circumferential deep groove extending continuously in a circumferential direction through the radial deep groove , the positive pressure generation grooves each have an upstream end communicating with the radial deep groove , and the circumferential deep groove is arranged in a radial space between the positive pressure generation grooves and the negative pressure generation groove , characterized in that the negative pressure generation groove has an upstream inlet portion , a downstream outlet portion , an intermediate portion between the inlet portion and the outlet portion , a first connection connecting the upstream inlet portion to the circumferential deep groove , and a second connection connecting the downstream outlet portion to the circumferential deep groove , and the upstream inlet portion and the downstream outlet portion each communicate with the sealed fluid side via the first and second connections, the circumferential deep groove , and the radial deep groove . <EOS>