A connector on an electronic device includes a pair of locking plates, a guide groove, and a space. Each locking plate has, on its edge, a first concave portion, a first convex portion, a second concave portion, and a second convex portion. An intermediate surface for determining a position of an accessory device below the guide groove is provided below the second concave portion and the second convex portion. A contact mounting surface provided with plural contacts is provided below the first convex portion. Guide surfaces for determining a position of the accessory device in the width direction of the guide groove are provided below the first concave portion and the first convex portion.