Electronic control unit

An electronic control unit comprising:

• a rack;
• an electronic device installable to the rack along an installation direction orthogonal to a thickness direction of the electronic device;
• a cooling plate disposed in the rack, the cooling plate being movable in the thickness direction of the electronic device;
• and
• a movable member disposed in the rack at a position to interpose the electronic device in a direction orthogonal to the installation direction and the thickness direction, the movable member holding the cooling plate to be movable in the thickness direction, the movable member having a protrusion protruding toward the electronic device, wherein
• the electronic device includes a pair of guide members disposed at ends in the direction orthogonal to the installation direction and the thickness direction,
• each of the guide members includes a guide groove to receive the protrusion of the movable member therein, the guide groove extending along the installation direction and having an open end on a leading side in the installation direction,
• the guide member has an inclined portion, as a part of the guide groove, inclined relative to the installation direction and a holding portion to hold the protrusion at an end of the guide groove opposite to the open end in the installation direction,
• the guide groove is configured to allow the protrusion to move from the inclined portion to the holding portion after the electronic device is placed in a placement position facing the cooling plate during installation to the rack, and
• the electronic device is configured to cause the movable member to be pulled toward the electronic device in the thickness direction in accordance with movement of the protrusion toward the holding portion, so that the electronic device in the placement position is brought to a mounting state mounted on the rack.