POWER CONVERSION DEVICE

To provide a power conversion device in which high cooling performance is ensured in a wide range thereof.SOLUTION: A power conversion device 100 includes a substrate 100a that has a first member 60 and a second member 70; and a device circuit that is attached to the substrate 100a. A flow path 80 is formed between the first member 60 and the second member 70. At least one protruding first fin 68 is formed on a first facing surface of a surface that faces the second member 70 across the flow path 80, in the first member 60; and at least one protruding second fin 78 that extends along with the first fin 68 is formed on a second facing surface 76 of a surface that faces the first member 60 across the flow path 80, in the second member 70. Thereby, the flow path 80 is divided into a plurality of divided flow paths 84 taking each fin of the first fin 68 and the second fin 78 as a boundary.SELECTED DRAWING: Figure 2 【課題】電力変換装置内における広い範囲で、高い冷却性能を確保できるようにする。【解決手段】電力変換装置１００は、第１部材６０及び第２部材７０を有する基体１００ａと、基体１００ａに取り付けられている装置回路とを有する。第１部材６０及び第２部材７０の間には、流路８０が形成されている。第１部材６０における流路８０を挟んで第２部材７０に対向する面である第１対向面には、突条状の第１フィン６８が少なくとも１本形成され、第２部材７０における流路８０を挟んで第１部材６０に対向する面である第２対向面７６には、第１フィン６８と並んで延びる突条状の第２フィン７８が少なくとも１本形成されている。それにより、第１フィン６８及び第２フィン７８の各フィンを境に流路８０が複数本の分割流路８４に区分けされている。【選択図】図２