The invention relates to a device (10) for storing pressurized gas, comprising a plurality of storage tanks (11) which each have a tank wall (12) which encloses a hollow space (15) intended for the storage of the pressurized gas. The storage tanks (11) are connected to each other and have at least one connection for introducing and/or discharging the pressurized gas. To configure the storage tanks (11) such that they are as stable as possible each storage tank (11) has preferably one covering layer (16) which is positioned on the tank wall (12) at least in partial areas of every storage tank (11). In addition, to allow for the individual adjustment of the geometrical structure of the device (10) to the spaces available and to the quantity of gas to be stored, every storage tank (11) has an upper part (20) which is joined to the tank wall (12) and the storage tanks (11) are or can be connected with each other in a modular manner by means of these upper parts (20). The pressurized gas is withdrawn from the storage tanks (11) through a flow channel (24) provided for in the upper parts (20) which communicate with the hollow space (15) of each storage tank (11) via a through hole (26). The individual upper parts (20) are joined by means of connecting elements (23) which are introduced into corresponding openings located in the upper parts (20).