A pressure accumulator, in particular a pulsation damper, having an accumulator housing (1) which defines a longitudinal axis (3) and has an inflow opening (15) and an outflow opening (17) for a fluid, wherein two working spaces, in particular 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 fluid-tight manner, in particular in a gas-tight manner, by a bellows-like separating member (21), and the separating member (21) is connected at its 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) which is axially movable in the accumulator housing (1) and forms a movable termination of the gas space (23), such that working movements of the piston part (31) bring about changes in volume of the working spaces adjoining the separating member (21), is characterized in that 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), such that fluid can flow through the accumulator housing (1) in its longitudinal direction and in the direction of the working movement of the piston part (31).