An electronic component includes a main body and signal terminals projecting in a projection direction of a module control terminal, the signal terminals being arranged in an arrangement direction. Through-holes are formed in a control board, and the signal terminals are inserted into the through-holes. In a case, an opening that opens in the projection direction is formed, and ends of the signal terminals are positioned in the projection direction. At a position adjacent to a through-hole group including the through-holes in the arrangement direction, a communication space is formed which makes a first space, which is positioned at a side of electronic component in the projection direction, communicate with a second space opposite to the first space. When a length of the through-hole group is a, and a distance between the through-hole group and the communication space is b, a length of the communication space is longer than a+b.