The present invention provides a sliding vane, which is provided through a rotor in a cylinder and reciprocates in a diametrical direction and rotates together with the rotor. The sliding vane of the present invention includes a vane body (10), which has plate seating slots (23a) and (23b) formed in the respective diametrical opposite ends of the vane body. The sliding vane further includes two pairs of compression plates (3a) and (3b), (3c) and (3d), which are provided in the plate seating slots. First springs (15) are provided in a diametrically inner end of each compression plate. A sealing rod insertion slot (7a), (7b), (7c), (7d) is formed in a diametrically outer end of each compression plate, and a second spring (19) is provided between axially inner ends of the adjacent compression plates. The sliding vane further includes a sealing rod (5a), (5b) which is inserted into and occupies the entire length of the sealing rod insertion slots of adjacent compression plates placed in each plate seating slot.