A pair of sliding parts (3, 5) comprising sealing faces that relatively slide on each other, wherein: a plurality of fluid circulation grooves each including an inlet section where a fluid comes in from a high pressure fluid side, an outlet section where the fluid goes out to the high pressure fluid side, and a communication section that provides communication between the inlet section and the outlet section, is provided on one of the sealing faces in the circumferential direction of the sealing face; the plurality of fluid circulation grooves is isolated from a low pressure fluid side by the land section; characterized in that the plurality of fluid circulation grooves are isolated from one another by a land section; wherein at least a sectional area of the groove in the inlet section or the outlet section is set to be different from a sectional area of the groove in the communication section in such a manner that pressure of the fluid flowing through the fluid circulation groove is lowered in the communication section; a plurality of positive pressure generation grooves that is shallower than the plurality of fluid circulation grooves is each provided in a part surrounded by each of the fluid circulation grooves and the high pressure fluid side; each of the positive pressure generation grooves communicates with the inlet section on a downstream side of the inlet section, and is isolated from the outlet section and the high pressure fluid side by the land section; a plurality of negative pressure generation grooves that is shallower than the plurality of fluid circulation grooves is each provided between adjacent two of the fluid circulation grooves on the outside of the part surrounded by each of the fluid circulation grooves and the high pressure fluid side; and each of the negative pressure generation grooves communicates with the inlet section on an upstream side of the inlet section, and is isolated from the outlet section and the low pressure fluid side and the high pressure fluid side by the land section. a plurality of fluid circulation grooves each including an inlet section where a fluid comes in from a high pressure fluid side, an outlet section where the fluid goes out to the high pressure fluid side, and a communication section that provides communication between the inlet section and the outlet section, is provided on one of the sealing faces in the circumferential direction of the sealing face; the plurality of fluid circulation grooves is isolated from a low pressure fluid side by the land section; characterized in that the plurality of fluid circulation grooves are isolated from one another by a land section; wherein at least a sectional area of the groove in the inlet section or the outlet section is set to be different from a sectional area of the groove in the communication section in such a manner that pressure of the fluid flowing through the fluid circulation groove is lowered in the communication section; a plurality of positive pressure generation grooves that is shallower than the plurality of fluid circulation grooves is each provided in a part surrounded by each of the fluid circulation grooves and the high pressure fluid side; each of the positive pressure generation grooves communicates with the inlet section on a downstream side of the inlet section, and is isolated from the outlet section and the high pressure fluid side by the land section; a plurality of negative pressure generation grooves that is shallower than the plurality of fluid circulation grooves is each provided between adjacent two of the fluid circulation grooves on the outside of the part surrounded by each of the fluid circulation grooves and the high pressure fluid side; and each of the negative pressure generation grooves communicates with the inlet section on an upstream side of the inlet section, and is isolated from the outlet section and the low pressure fluid side and the high pressure fluid side by the land section.