Electronic control device

An electronic control device comprising:

• a housing which has an inner surface provided with a plurality of bosses including a first boss and a second boss;
• a circuit board which is housed in an internal space of the housing;
• a first heat generating component which is mounted on the circuit board and thermally connected to the housing via the first boss;
• a second heat generating component which is mounted on the circuit board and thermally connected to the housing via the second boss;
• a plurality of heat dissipation fins which are formed on an outer surface of the housing;
• and
• a fan which is mounted on the outer surface of the housing and blows air toward the heat dissipation fin,
• wherein a first projection protruding toward the circuit board is provided on the inner surface of the housing, and
• when, in the housing, a region immediately above a mounting position of the first heat generating component is defined as a first region, a region immediately above a mounting position of the second heat generating component is defined as a second region, and a region between the first region and the fan in an air blowing direction of the fan is defined as a third region,
• one end side of the first projection is arranged in a state of being connected to the second boss, and
• another end side of the first projection extends toward the third region so as to transport heat generated by the second heat generating component to the third region.