Capacitor with seat plate

A seat-plate-mounted capacitor comprising:

• a capacitor body;
• and
• a seat plate in which the capacitor body is installed, wherein:
• the capacitor body includes:
• a case including a tubular part having a cylindrical shape and a bottom wall closing a first end of the tubular part;
• and
• a sealing member closing a second end of the tubular part, the second end being opposite to the first end,
• the capacitor body is disposed so that the sealing member is adjacent to the seat plate,
• the seat plate includes:
• a base part;
• and
• a support wall extending from the base part along a circumferential surface of the tubular part,
• the tubular part has an annular recess surrounding the tubular part, a first maximum diameter portion, and a second maximum diameter portion, the annular recess being located in a portion of the tubular part that contacts the sealing member and being recessed toward the sealing member, the first maximum diameter portion being disposed closer to the bottom wall than the annular recess is, the second maximum diameter portion being disposed closer to the second end than the annular recess is,
• a diameter A of the first maximum diameter portion, a diameter B of the second maximum diameter portion, and an inner diameter C of the support wall satisfy a relation A>C>B in a state that the capacitor body is not installed in the seat plate,
• the support wall includes two or more support posts,
• two or more support posts includes a first support post and a second support post, the second support post having a lower height than the first support post, and
• a distance H1 from an outer surface of the base part of the seat plate to a tip end of the first support post and a distance H2 from the outer surface of the base part of the seat plate to a tip end of the second support post satisfy a relation 1.10≤H1/H2≤1.22.