Electric circuit body and power conversion device

An electric circuit body comprising:

• a power semiconductor element joined to one surface of a conductor plate;
• a sheet member including an insulating layer joined to the other surface of the conductor plate;
• a sealing member that integrally seals the sheet member, the conductor plate, and the power semiconductor element in a state in which a surface of the sheet member opposite to a surface joined to the conductor plate is exposed;
• a cooling member that cools heat of the power semiconductor element;
• and
• a heat conduction member provided between the opposite surface of the sheet member and the cooling member,
• wherein the heat conduction member is provided over a first projection region facing the conductor plate and a second projection region facing the sealing member, and a thickness of the heat conduction member is thicker in the second projection region than in the first projection region, and
• wherein the sheet member is depressed in the sealing member to form a concave portion, and the heat conduction member enters the concave portion.