[Problems] In a reduction in fluid pressure pulsation, a large space has been required for liquid expansion and a larger pressure loss has been involved.;[Solving Means] A pressure pulsation reducing device has a flow path through which pressure pulsation is transmitted, an inner tube placed in the flow path and constructed so that most part of fluid flowing inside the flow path flows around the inner tube, and small holes provided in the inner tube for expelling jet flows into the flow path by a pressure difference between the inside and the outside of the inner tube. The jet flows are expelled from the inner tube to a contracted flow section provided around the outer periphery of the inner tube to reduce pressure pulsation of the contracted flow section.
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