Abstract: A rotary compressor includes a cylinder having a cylindrical compressing chamber, an eccentrically movable rotor disposed in the compressing chamber, and a reciprocally movable blade disposed in a blade guide groove which extends from the compressing chamber in a radial direction. The blade is provided with a pair of projections respectively extending from the one end of the blade toward the bottom of the blade guide groove, and the other end of the blade contacts the peripheral surface of the rotor. A pair of depressions are respectively formed at the bottom of the blade guide groove for permitting the projection pairs of the blade to reciprocally move into the corresponding depressions, thereby increasing the contacting portion between the blade and the blade guide groove in comparison with a conventional rotary compressor when the blade moves into the compressing chamber at a prescribed length.