A connector-connecting jig used to connect a first connector disposed at one end of a strip-shaped flexible cable, which has another end fixed to a bottom surface of a housing-shaped electronic device body, to a second connector on a substrate. The first connector is disposed on a surface of the flexible cable opposite to said bottom surface. The connector-connecting jig includes a base having a placement surface on which the electronic device body is placed; a body fixing unit that fixes the electronic device body onto the placement surface; and a connector supporting member that extends over the electronic device body and contacts a surface of the flexible cable on a rear surface side of the first connector when the flexible cable is lifted upward from said bottom surface of the electronic device body fixed onto the placement surface.