Substrate unit and electronic device
According to one embodiment, a substrate unit includes an electronic circuit substrate which includes a first width dimension portion, and a second width dimension portion continuous with the front direction side of the first width dimension portion. A first concave portion is formed on the first direction side of the first width dimension portion and a second concave portion is formed on the second direction side of the first width dimension portion in the electronic circuit substrate. The substrate unit includes a heat sink which includes a first side frame portion fixed to the first width dimension portion from the first concave portion, a second side frame portion fixed to the first width dimension portion from the second concave portion, and a sink main body portion continuous from the first side frame portion to the second side frame portion.