In a rotary compressor, when it is assumed that a vane width is W, the amount of eccentricity of an eccentric portion is e, a vane leading end curvature radius is R.sub.v, an annular piston radius is R.sub.ro, and a non-sliding region width on each of both side portions of a vane leading end is W.sub.t, the vane width W and the vane leading end curvature radius R.sub.v are set such that the non-sliding region width W.sub.t on each of both the side portions of the vane leading end defined by the following equation (A) is a value satisfying an equation (B):

W.sub.t=(W/2)eR.sub.v/(R.sub.v+R.sub.ro)(A)

0.3 mmW.sub.t0.6 mm(B).

A rotary compressor is provided that may include a casing, a cylinder, a main bearing, a sub bearing, a rotational shaft, a roller, and at least one vane. The cylinder may include at least one elastic deformation unit to absorb impact with the at least one vane. With this structure, a collision force caused due to chattering of the at least one vane may be absorbed to suppress or prevent friction loss and/or wear between the cylinder and the vane, thereby enhancing compressor efficiency, reducing vibration noise, and enabling fast initial actuation.

Provided is a compressor including a high-pressure chamber type hermetic container in which refrigerant containing hydrofluoroolefin refrigerant of 50 mass % or more and refrigerator oil are sealed; and a compression mechanism housed in the hermetic container and having a sliding portion made of an iron-based material, in which the refrigerator oil includes at least one refrigerator oil of polyvinyl ether or polyol ester, and a kinematic viscosity of the refrigerator oil at 40 C. is 10 mm.sup.2/s or more and 40 mm.sup.2/s or less.