Solid electrolytic capacitor

A solid electrolytic capacitor comprising:

• a capacitor element including an anode part and a cathode part;
• an anode lead frame electrically connected to the anode part;
• a cathode lead frame electrically connected to the cathode part;
• and
• an exterior body that covers the capacitor element, wherein:
• the anode lead frame includes a first buried part that is a part of the anode lead frame, the first buried part being buried in the exterior body,
• the cathode lead frame includes a second buried part that is a part of the cathode lead frame, the second buried part being buried in the exterior body,
• a plurality of recesses are formed on a surface of at least one of the first buried part or the second buried part,
• the plurality of recesses include a plurality of first recesses formed on a surface of the first buried part,
• the solid electrolytic capacitor further comprises an insulating film disposed to cover at least one selected from the group consisting of at least a part of the anode part and at least one of the plurality of first recesses,
• the anode lead frame includes a base material and a plating layer formed on the base material,
• the plurality of first recesses are formed to penetrate the plating layer so that the base material is exposed from the plating layer,
• the insulating film is in contact with both the plating layer and the base material exposed from the plating layer in each of the plurality of first recesses,
• the exterior body includes a first insulating filler,
• the insulating film includes a second insulating filler, and
• a content (mass %) of the second insulating filler in the insulating film is less than a content (mass %) of the first insulating filler in the exterior body.

A solid electrolytic capacitor comprising:

• a capacitor element including an anode part and a cathode part;
• an anode lead frame electrically connected to the anode part;
• a cathode lead frame electrically connected to the cathode part;
• and
• an exterior body that covers the capacitor element, wherein:
• the anode lead frame includes a first buried part that is a part of the anode lead frame, the first buried part being buried in the exterior body,
• the cathode lead frame includes a second buried part that is a part of the cathode lead frame, the second buried part being buried in the exterior body,
• a plurality of recesses are formed on a surface of at least one of the first buried part or the second buried part,
• the plurality of recesses include a plurality of first recesses formed on a surface of the first buried part,
• the solid electrolytic capacitor further comprises an insulating film disposed to cover at least one selected from the group consisting of at least a part of the anode part and at least one of the plurality of first recesses,
• the anode lead frame includes a base material and a plating layer formed on the base material,
• the plurality of first recesses are formed to penetrate the plating layer so that the base material is exposed from the plating layer,
• the insulating film is in contact with both the plating layer and the base material exposed from the plating layer in each of the plurality of first recesses,
• the exterior body includes a first insulating filler,
• the insulating film includes a second insulating filler, and
• an average particle size of the second insulating filler is smaller than an average particle size of the first insulating filler.