A connector includes a flat-plate housing made of insulating resin and a contact held on a housing by press-fitting. The housing includes a press-fitting space and a solder connection checking hole. The contact includes a press-fit part to be press-fit into the press-fitting space, and a soldering part that extends from the press-fit part and is connected by soldering to a pad of an input-output board. The solder connection checking hole is formed to penetrate the housing in the vertical direction and allow a solder fillet, which is formed when the soldering part is soldered to the pad of the input-output board, to be checked through the solder connection checking hole. The housing includes a separating wall that separates the press-fitting space from the solder connection checking hole.