Patent ID: 7798839

Claim:
A casing mechanism comprising: a casing; a board support provided to the casing, and to which a first circuit board on which a first connector is mounted is fastened with a screw; stress absorbing means provided to the casing, for fastening with a screw a second circuit board on which a second connector for connection to the first connector is mounted, in a state where the first connector and the second connector are connected to each other, wherein the stress absorbing means comprises: a first fixing lug including a screw hole perpendicular to a plane direction of the first circuit board; and a second fixing lug provided at a position closer to the first connector and the second connector than to the first fixing lug, the second fixing lug having elasticity so that the second fixing lug can move in the plane direction of the first circuit board and having a screw hole in the same direction as the plane direction of the first circuit board.