Capacitor unit and power conversion device

A capacitor unit, comprising:

• a plurality of capacitors each having a cylindrical portion extending in a first direction;
• a housing on which the plurality of capacitors are mounted;
• and
• a plurality of fixation members for fixing the plurality of capacitors to the housing, each of the plurality of fixation members having a main part that has a band shape and mounted to the cylindrical portion, and a pair of fin portions that are bonded to opposing ends of the main part in an extension direction of the main part, wherein
• the plurality of capacitors include a plurality of first capacitors,
• the plurality of fixation members include a plurality of first fixation members corresponding to the plurality of first capacitors,
• the housing includes a first base member on which the plurality of first capacitors are mounted, wherein
• the first base member includes:
• a first bottom plate extending in a second direction orthogonal to the first direction, on which the plurality of first capacitors are aligned in the second direction as an alignment direction;
• and
• a first side plate bonded to an end of the first bottom plate in a third direction orthogonal to the first direction and the second direction, the first side plate being arranged upright in the first direction on the first bottom plate, wherein
• the pair of fin portions of each of the plurality of first fixation members are mounted on the first side plate to fix the plurality of first capacitors to the first base member, wherein
• on the first side plate,
• among the plurality of first fixation members, first fixation members on odd rows in the alignment direction are equal in position in the first direction,
• first fixation members on even rows in the alignment direction are equal in position in the first direction and differ, in position in the first direction, from first fixation members on the odd rows, and
• fin portions of two first fixation members that are adjacent to each other in the second direction are aligned in the first direction.