Electronic device

An electronic device, comprising:

• a heat-receiving block being heat conductive, the heat-receiving block having a first main surface to which an electronic component is attachable;
• a heat transfer member attached to the heat-receiving block, the heat transfer member extending away from a second main surface of the heat-receiving block located opposite to the first main surface of the heat-receiving block and facing vertically upward, the heat transfer member being configured to transfer heat transferred from the electronic component through the heat-receiving block away from the second main surface;
• a plurality of fins attached to the heat transfer member, the plurality of fins being configured to dissipate heat transferred from the electronic component through the heat-receiving block and the heat transfer member into ambient air, the plurality of fins being arranged in at least one of a width direction of a vehicle or a travel direction of the vehicle with spaces between the plurality of fins;
• and
• a cover including a side wall and a lid, the side wall extending in a direction surrounding a normal line to the second main surface, the lid being attached to the side wall with the heat transfer member located between the lid and the heat-receiving block, the cover accommodating the heat transfer member and the plurality of fins in a space surrounded by the side wall and the lid, wherein
• the cover has a vent in at least an outer surface of the side wall intersecting with the travel direction of the vehicle, and a ratio of an open area of the vent on the side wall to an area of the outer surface of the side wall is higher than a ratio of an open area of a vent on the lid to an area of an outer surface of the lid.