A connector includes a connector housing made of an insulator, a first terminal having one end fixed to the connector housing and the other end connected to an opposite side connector, and a second terminal having one end electrically connected to a circuit on a substrate and the other end fixed to the connector housing. The connector housing includes an opening which is open in a direction orthogonal to a surface of the substrate in a state of being mounted on the substrate and through which one end of the first terminal and the other end of the second terminal enter. The opening permits an electronic component being connected to one end of the first terminal and the other end of the second terminal to enter thereinto.