A rotary compressor (1; 101; 201) comprising a compression mechanism (4; 104; 204) and a driving mechanism including a drive shaft driving the compression mechanism (4;104; 204), the compression mechanism (4; 104; 204) and the driving mechanism being housed in the rotary compressor (1; 101; 201), the compression mechanism (4; 104; 204) including: a plurality of cylinders (30, 50; 50, 130; 230, 250) in which compression chambers (31, 51) are formed, respectively, the cylinders (30, 50; 50, 130;230, 250) being aligned in the axial direction of the drive shaft so that the drive shaft is inside the compression chambers (31, 51); a plurality of end plates (20, 40, 60; 40, 60, 120; 20, 60, 240) provided at both ends of the cylinders (30, 50; 50, 130; 230, 250) in the axial direction to define the compression chambers (31, 51); and a plurality of pistons (32, 52) provided in the respective compression chambers (31, 51) and driven by the drive shaft, wherein the cylinders (30, 50; 50, 130; 230, 250) include a first cylinder (30; 130; 250) and a second cylinder (50; 50; 230) adjacent to the first cylinder (30; 130; 250) via one of the end plates(20, 40, 60; 40, 60, 120; 20, 60, 240), a suction passage including a first passage (30a; 120a, 120b, 130a; 250a) and a second passage (30b, 40a, 50a; 130b, 40a, 50a; 250b, 240a, 230a) branched from the first passage (30a; 120a, 120b, 130a; 250a) is formed in the rotary compressor (1; 101; 201), the first passage supplies the compression chamber (31; 31; 51) of the first cylinder (30; 130; 250) with refrigerant from an external device via a suction pipe, and the second passage (30b, 40a, 50a; 130b, 40a, 50a; 250b, 240a, 230a) supplies the compression chamber (51; 51; 31) of the second cylinder (50; 50; 230) with the refrigerant, characterised in that the surface area of a region facing the suction passage in the second cylinder (50; 50; 230) is smaller than the surface area of a region facing the suction passage in the first cylinder (30; 130; 250), and a difference between the height (A3; A3; A1) of the second cylinder (50; 50; 230) in the axial direction and the height (A4; A4; A2) in the axial direction of the piston (52; 52; 32) provided in the compression chamber (51; 51; 31) of the second cylinder (50; 50; 230) is smaller than a difference between the height (A1; A1; A3) of the first cylinder (30; 130; 250) in the axial direction and the height (A2; A2; A4) in the axial direction of the piston (32; 32; 52) provided in the compression chamber (31; 31; 51) of the first cylinder (30; 130; 250). a plurality of cylinders (30, 50; 50, 130; 230, 250) in which compression chambers (31, 51) are formed, respectively, the cylinders (30, 50; 50, 130;230, 250) being aligned in the axial direction of the drive shaft so that the drive shaft is inside the compression chambers (31, 51); a plurality of end plates (20, 40, 60; 40, 60, 120; 20, 60, 240) provided at both ends of the cylinders (30, 50; 50, 130; 230, 250) in the axial direction to define the compression chambers (31, 51); and a plurality of pistons (32, 52) provided in the respective compression chambers (31, 51) and driven by the drive shaft, wherein the cylinders (30, 50; 50, 130; 230, 250) include a first cylinder (30; 130; 250) and a second cylinder (50; 50; 230) adjacent to the first cylinder (30; 130; 250) via one of the end plates(20, 40, 60; 40, 60, 120; 20, 60, 240), a suction passage including a first passage (30a; 120a, 120b, 130a; 250a) and a second passage (30b, 40a, 50a; 130b, 40a, 50a; 250b, 240a, 230a) branched from the first passage (30a; 120a, 120b, 130a; 250a) is formed in the rotary compressor (1; 101; 201), the first passage supplies the compression chamber (31; 31; 51) of the first cylinder (30; 130; 250) with refrigerant from an external device via a suction pipe, and the second passage (30b, 40a, 50a; 130b, 40a, 50a; 250b, 240a, 230a) supplies the compression chamber (51; 51; 31) of the second cylinder (50; 50; 230) with the refrigerant, characterised in that the surface area of a region facing the suction passage in the second cylinder (50; 50; 230) is smaller than the surface area of a region facing the suction passage in the first cylinder (30; 130; 250), and a difference between the height (A3; A3; A1) of the second cylinder (50; 50; 230) in the axial direction and the height (A4; A4; A2) in the axial direction of the piston (52; 52; 32) provided in the compression chamber (51; 51; 31) of the second cylinder (50; 50; 230) is smaller than a difference between the height (A1; A1; A3) of the first cylinder (30; 130; 250) in the axial direction and the height (A2; A2; A4) in the axial direction of the piston (32; 32; 52) provided in the compression chamber (31; 31; 51) of the first cylinder (30; 130; 250).