Pressure damping device

A pressure damping device (1) includes: a cylinder (10); a piston (31) provided movably in the cylinder (12) in an axial direction of the cylinder, and formed to have a plurality of channels (311, 312) for liquid; a moving and partitioning member (35) located between the piston and the cylinder, and provided movably from one end to the other end in the axial direction of a movable region (36) provided in the piston (31), and configured to partition a space in the cylinder into a first liquid chamber (Y1) and a second liquid chamber (Y2) for storing the liquid; a first opening and closing member (32) configured to open and close an opening in at least a part of the plurality of channels of the piston and open the opening; and a second opening and closing member (33) configured to open and close an opening in at least a part of the plurality of channels (311, 312) and open the opening.