A connector characterized in that it: is a connector that has a plurality of plate-shaped terminals that include openings able to enclose protruding terminals of the other half of the connector, and that mates with the other half of the connector. The openings comprise a wide portion, a narrow portion and a transitional portion that transitions from the wide portion to the narrow portion, and, in a top view, are provided with a first shape that is left-right asymmetric with respect to the centerline of the plate-shaped terminals, or a second shape whereby the first shape is inverted about the centerline. The plate-shaped terminals are arrayed lined up in the width direction of the connector, and arrayed such that the plate-shaped terminals comprising an opening having the first shape and the plate-shaped terminals comprising an opening having the second shape alternate.