A board holding apparatus holds an electric circuit board between a first case and a second case. The board holding apparatus includes locking parts that lock the first case and the second case together in a thickness direction of the electric circuit board such that the first case and the second case are not separated from each other and a bearing surface formed on the second case, the electric circuit board coming into contact with the bearing surface in the thickness direction. The board holding apparatus includes a spring that generates an elastic force, with the locking parts locking the first case and the second case together, the spring being formed on the first case and the elastic force pressing the bearing surface through the electric circuit board.
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