A U-shaped pulse-tube refrigerator includes a regenerative tube and a pulse-tube that are juxtaposed with each other; a communicating path that connects a low-temperature end of the regenerative tube and a low-temperature end of the pulse-tube; a heat exchanger that is provided at the low-temperature end of at least one of the regenerative tube and the pulse-tube; and a flow smoothing member that is provided between a first exit of the communicating path at a side where the heat exchanger is provided and the heat exchanger.
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