In a module, press-fit connection using a pin terminal (1) including a connection part (2) separated into two parts and a flat plane (2a) parallel to the lengthwise direction in the separation part and perpendicular to the separation direction of the pin terminal (1) is performed. A through-hole of a board is structured so that (1) an inner diameter of the through-hole at a middle part in the thickness direction of the board is smaller than that at obverse and reverse surfaces of the board (4) and (2) the length of the middle part of the through-hole connected to the pin terminal (1) is shorter than the length of the flat plane (2a) of the pin terminal (1).