ROTARY COMPRESSOR

This rotary compressor is provided with a blade that abuts on an outer peripheral surface of a piston rotor and partitions the space of a compression room, and a pressure spring that presses a base end of the blade. A cylinder (60) is provided with a blade groove (66) for slidably holding the base end of the blade, a bridge part (70) that is provided on a rear end side of the blade groove (66) and forms an outer peripheral part of the cylinder (60), and a spring groove (72) that is formed in the bridge part (70) and accommodates the pressure spring. The spring groove (72) is formed to be oriented in a horizontal direction orthogonal to the axial direction of the cylinder (60). When the cylinder (60) is viewed in a longitudinal section including a spring groove central axis (CL2) of the spring groove (72), the blade groove (66), and the bridge part (70), remaining portions (70a) of the bridge part (70) that are positioned on both sides in the axial direction of the spring groove (72) have a dimension v in the horizontal direction and a dimension h in the axial direction, where v < h.