capacitor package that is spatial propagation noise coupling in addition to the structure to decrease noise coupling in the following the structure of a capacitor package including a structure for achieving this reduction will be described as second and third examples the attached fig5 is a structure in a capacitor package 90 according to the second example in this example in addition to the first example as also illustrated in the drawing a slit shaped space is provided between the capacitor c 3 and the capacitor c 5 in the capacitor package 90 and a shield wall 102 at the same potential as the potential gnd of the casing 101 is inserted into the slit and disposed with this structure switching noise emitted from the capacitor c 4 and caused by switching the inverter 40 is blocked by the shield wall 102 so that it is possible to further decrease noise coupling between the positive electrode bus bars of the converter 10 and the inverter 40 moreover the attached fig6 is a structure in a capacitor package 90 according to the third example in this example the smoothing capacitor components c 1 and c 4 of the two systems are.