Abstract: A pressure accumulator, in particular a pulsation damper, has an accumulator housing (1) defining a longitudinal axis (3) and having an inflow opening (15) and an outflow opening (17) for a fluid. A gas space (23) for a working gas and a fluid space (33) are separated from one another inside the accumulator housing (1) in a gas-tight manner by a bellows-like separating member (21). The separating member (21) is connected at one end (25) to a lid (27) forming a fixed termination of the gas space (23) in relation to the housing and at its other end (29) to a piston part (31) axially movable in the accumulator housing (1) and forming a movable termination of the gas space (23). Working movements of the piston part (31) bring about changes in volume of the working spaces adjoining the separating member (21). Inflow opening (15) and outflow opening (17) are respectively provided at the one end and at the other end, opposite one another in the axial direction of the accumulator housing (1).