A thin connector includes a first connector and a second connector both having a flat plate shape, the first connector includes first conductive layers disposed on a first insulating layer and superimposed on one another via an intermediate insulating layer, each first conductive layer has a spring contact array, among the first conductive layers, a first conductive layer closer to the first insulating layer has the spring contact array disposed more frontward in the fitting direction while a first conductive layer farther from the insulating layer has the spring contact array disposed more rearward in the fitting direction, the second connector includes a single second conductive layer disposed on a second insulating layer, the second conductive layer has projection arrays, among the projection arrays, a projection array disposed more frontward in the fitting direction are lower while a projection array disposed more rearward in the fitting direction are higher.