A power converter that performs DC voltage conversion between a pair of first DC terminals and a pair of second DC terminals, the power converter comprising: a plurality of DC/AC converters each having DC nodes, the DC nodes of the plurality of DC/AC converters being connected in parallel or in series between the first DC terminals; a plurality of AC/DC converters each having DC nodes, the DC nodes of the plurality of AC/DC converters being connected in parallel or in series between the second DC terminals; and a multiple transformer connected between the DC/AC converters and the AC/DC converters, the multiple transformer including a plurality of primary windings each connected to a corresponding one of AC nodes of the respective DC/AC converters, a plurality of secondary windings each connected to a corresponding one of AC nodes of the respective AC/DC converters, and a core portion around which the primary windings and the secondary windings are wound, the core portion being configured such that a magnetic path is shared among the primary windings and the secondary windings, wherein each winding of one of a group of the primary windings and a group of the secondary windings is so divided as to be wound around first portions of the core portion respectively, and each winding of the other of the group of the primary windings and the group of the secondary windings is wound around a second portion of the core portion without being divided, the second portion being sandwiched between the first portions of the core portion, a corresponding winding of the one group being wound around the first portions, characterised in that either the primary windings or the secondary windings, depending on which is rated for the relatively lower voltage, are the ones being divided and sandwiching the other of the secondary windings and the primary windings having the relatively higher voltage than said lower voltage. a plurality of DC/AC converters each having DC nodes, the DC nodes of the plurality of DC/AC converters being connected in parallel or in series between the first DC terminals; a plurality of AC/DC converters each having DC nodes, the DC nodes of the plurality of AC/DC converters being connected in parallel or in series between the second DC terminals; and a multiple transformer connected between the DC/AC converters and the AC/DC converters, the multiple transformer including a plurality of primary windings each connected to a corresponding one of AC nodes of the respective DC/AC converters, a plurality of secondary windings each connected to a corresponding one of AC nodes of the respective AC/DC converters, and a core portion around which the primary windings and the secondary windings are wound, the core portion being configured such that a magnetic path is shared among the primary windings and the secondary windings, wherein a plurality of primary windings each connected to a corresponding one of AC nodes of the respective DC/AC converters, a plurality of secondary windings each connected to a corresponding one of AC nodes of the respective AC/DC converters, and a core portion around which the primary windings and the secondary windings are wound, the core portion being configured such that a magnetic path is shared among the primary windings and the secondary windings, wherein each winding of one of a group of the primary windings and a group of the secondary windings is so divided as to be wound around first portions of the core portion respectively, and each winding of the other of the group of the primary windings and the group of the secondary windings is wound around a second portion of the core portion without being divided, the second portion being sandwiched between the first portions of the core portion, a corresponding winding of the one group being wound around the first portions, characterised in that either the primary windings or the secondary windings, depending on which is rated for the relatively lower voltage, are the ones being divided and sandwiching the other of the secondary windings and the primary windings having the relatively higher voltage than said lower voltage.