A filter module for a power conversion device, comprising: a capacitor module, an inductor module, and a case member, wherein the capacitor module includes: a positive-electrode side bus bar in which a positive-electrode terminal is formed, a negative-electrode side bus bar in which a negative-electrode terminal is formed, and a plurality of capacitor elements connected to the positive-electrode side bus bar and the negative-electrode side bus bar, respectively, wherein the inductor module includes: an inductor bus bar, and a magnetic member through which the inductor bus bar is inserted, and wherein the case member is characterized by: a first space in which the capacitor module is accommodated, a second space in which the inductor module is accommodated, wherein, when the capacitor module is accommodated in the first space and the inductor module is accommodated in the second space, the negative-electrode side bus bar of the capacitor module is arranged on the inductor module side, so that heat generated from the inductor module is dissipated via the negative-electrode side bus bar of the capacitor module, and wherein, a potting material is filled in the first space accommodating the capacitor module and a potting material is filled in the second space accommodating the inductor module, and wherein the first space and the second space of the case member are separated by a wall from each other, such that different types of potting materials are used in the first space in which the capacitor module is accommodated, and in the second space in which the inductor module is accommodated. a capacitor module, an inductor module, and a case member, wherein the capacitor module includes: a positive-electrode side bus bar in which a positive-electrode terminal is formed, a negative-electrode side bus bar in which a negative-electrode terminal is formed, and a plurality of capacitor elements connected to the positive-electrode side bus bar and the negative-electrode side bus bar, respectively, a positive-electrode side bus bar in which a positive-electrode terminal is formed, a negative-electrode side bus bar in which a negative-electrode terminal is formed, and a plurality of capacitor elements connected to the positive-electrode side bus bar and the negative-electrode side bus bar, respectively, wherein the inductor module includes: an inductor bus bar, and a magnetic member through which the inductor bus bar is inserted, and wherein the case member is characterized by: a first space in which the capacitor module is accommodated, a second space in which the inductor module is accommodated, wherein, when the capacitor module is accommodated in the first space and the inductor module is accommodated in the second space, the negative-electrode side bus bar of the capacitor module is arranged on the inductor module side, so that heat generated from the inductor module is dissipated via the negative-electrode side bus bar of the capacitor module, and wherein, a potting material is filled in the first space accommodating the capacitor module and a potting material is filled in the second space accommodating the inductor module, and wherein the first space and the second space of the case member are separated by a wall from each other, such that different types of potting materials are used in the first space in which the capacitor module is accommodated, and in the second space in which the inductor module is accommodated. a first space in which the capacitor module is accommodated, a second space in which the inductor module is accommodated, wherein, when the capacitor module is accommodated in the first space and the inductor module is accommodated in the second space, the negative-electrode side bus bar of the capacitor module is arranged on the inductor module side, so that heat generated from the inductor module is dissipated via the negative-electrode side bus bar of the capacitor module, and wherein, a potting material is filled in the first space accommodating the capacitor module and a potting material is filled in the second space accommodating the inductor module, and wherein the first space and the second space of the case member are separated by a wall from each other, such that different types of potting materials are used in the first space in which the capacitor module is accommodated, and in the second space in which the inductor module is accommodated.