A compressor and an air conditioner. The compressor includes a crankshaft, a first roller, a second roller, a motor rotor and one balancing block. The interior of the first roller is a solid structure, and the interior of the second roller has a hollow portion. The balancing block is disposed at one axial end of the motor rotor, and no balancing block is arranged at another axial end of the motor rotor. A mass center of the first eccentric portion and the first roller is a first mass center, and a first mass-center axis passes through the first mass center and is parallel to an axis of the crankshaft. A mass center of the second eccentric portion and the second roller is a second mass center, and a second mass-center axis passes through the second mass center and is parallel to the axis of the crankshaft.

A hermetic compressor may include a cylinder having an .[.elliptical.]. inner circumferential surface; a roller eccentric from the inner circumferential surface; and at least one vane withdrawn towards the inner circumferential surface when the roller is rotated to divide a compression .[.chamber.]. .Iadd.space into compression chambers.Iaddend.. .[.On the basis of.]. .Iadd.A first center line passes through .Iaddend.a .[. contact.]. .Iadd.reference .Iaddend.point where the inner circumferential surface .Iadd.of the cylinder .Iaddend.and an outer circumferential surface .Iadd.of the roller .Iaddend.are closest.[., a first center line passes.]. .Iadd.and .Iaddend.through a .Iadd.lateral .Iaddend.center of .Iadd.an inner space of .Iaddend.the cylinder.[., an.]. .Iadd.. A first pair of .Iaddend.ellipse .Iadd.segments are .Iaddend.positioned at a first side of the first center line and .[.forming.]. .Iadd.form portions of .Iaddend.the inner circumferential surface.[.is a first ellipse, a.]. .Iadd.. A .Iaddend.center point of the first .Iadd.pair of .Iaddend.ellipse .Iadd.segments .Iaddend.is a first center point.[., an.]. .Iadd.. A second pair of .Iaddend.ellipse .Iadd.segments are .Iaddend.positioned at a second side of the first center line and .[.forming.]. .Iadd.form portions of .Iaddend.the inner circumferential surface .[.is a second ellipse, a.]. .Iadd.. A .Iaddend.center point of the second .Iadd.pair of .Iaddend.ellipse .Iadd.segments .Iaddend.is a second center point, and the first center point and the second center point are spaced apart from the .Iadd.lateral .Iaddend.center .Iadd.of the inner space of the cylinder.Iaddend..