A sliding component comprising a pair of seal rings (3, 5) which are arranged to rotate relative to each other, wherein the seal rings (3, 5) have sliding surfaces (S1, S2), respectively, which are facing each other, and the sliding surfaces (S1, S2) are provided with: a land (9, 109) continuously extending in a circumferential direction; inward recessed portions (11, 111) recessed in an axial direction, extending to a radially inner side, and open to the radially inner side; and outward recessed portions (12, 112) recessed in the axial direction, extending to a radially outer side, and open to the radially outer side, characterized in that each of the inward recessed portions (11, 111) has a circumferential width which becomes larger toward the radially inner side, such that the inward recessed portion (11, 111) extends both in a clockwise direction and in a counterclockwise direction with respect to a radial line (D1, D3) passing through a radially-outermost end point of the inward recessed portion (11, 111), and wherein each of the outward recessed portions (12, 112) has a circumferential width which becomes larger toward the radially outer side, such that the outward recessed portion (12, 112) extends both in the clockwise direction and in the counterclockwise direction with respect to a radial line (D2, D4) passing through a radially-innermost end point of the outward recessed portion (12, 112). wherein the seal rings (3, 5) have sliding surfaces (S1, S2), respectively, which are facing each other, and the sliding surfaces (S1, S2) are provided with: a land (9, 109) continuously extending in a circumferential direction; inward recessed portions (11, 111) recessed in an axial direction, extending to a radially inner side, and open to the radially inner side; and outward recessed portions (12, 112) recessed in the axial direction, extending to a radially outer side, and open to the radially outer side, characterized in that each of the inward recessed portions (11, 111) has a circumferential width which becomes larger toward the radially inner side, such that the inward recessed portion (11, 111) extends both in a clockwise direction and in a counterclockwise direction with respect to a radial line (D1, D3) passing through a radially-outermost end point of the inward recessed portion (11, 111), and wherein each of the outward recessed portions (12, 112) has a circumferential width which becomes larger toward the radially outer side, such that the outward recessed portion (12, 112) extends both in the clockwise direction and in the counterclockwise direction with respect to a radial line (D2, D4) passing through a radially-innermost end point of the outward recessed portion (12, 112). a land (9, 109) continuously extending in a circumferential direction; inward recessed portions (11, 111) recessed in an axial direction, extending to a radially inner side, and open to the radially inner side; and outward recessed portions (12, 112) recessed in the axial direction, extending to a radially outer side, and open to the radially outer side, characterized in that each of the inward recessed portions (11, 111) has a circumferential width which becomes larger toward the radially inner side, such that the inward recessed portion (11, 111) extends both in a clockwise direction and in a counterclockwise direction with respect to a radial line (D1, D3) passing through a radially-outermost end point of the inward recessed portion (11, 111), and wherein each of the outward recessed portions (12, 112) has a circumferential width which becomes larger toward the radially outer side, such that the outward recessed portion (12, 112) extends both in the clockwise direction and in the counterclockwise direction with respect to a radial line (D2, D4) passing through a radially-innermost end point of the outward recessed portion (12, 112).