A sliding component comprising: a pair of sliding parts (3, 5) of which a rotating-side sliding part is rotatable in both forward and reverse directions, wherein at least one of the sliding parts (3, 5) has a sliding face including positive pressure generation grooves (11, 11') 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, 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 (11, 11') each have an upstream end (11a, 11a') communicating with the radial deep groove, and the circumferential deep groove is arranged in a radial space between the positive pressure generation grooves (11, 11') 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 (3, 5) of which a rotating-side sliding part is rotatable in both forward and reverse directions, wherein at least one of the sliding parts (3, 5) has a sliding face including positive pressure generation grooves (11, 11') 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, 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 (11, 11') each have an upstream end (11a, 11a') communicating with the radial deep groove, and the circumferential deep groove is arranged in a radial space between the positive pressure generation grooves (11, 11') 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.