An opening and closing apparatus comprising: a lower unit case; an upper unit case disposed above the lower unit case and configured to open and close with respect to the lower unit case; a hinge configured to connect the upper unit case to the lower unit case such that the upper unit case pivots with respect to the lower unit case a lower guide member disposed in the lower unit case and extending from a base end side toward a distal end side of the lower unit case; an upper guide member disposed in the upper unit case and extending from a base end side toward a distal end side of the upper unit case; and an opening/closing linking unit comprising a first rotating member, a second rotating member and a linking portion, the linking portion being configured to link the first rotating member and the second rotating member, wherein as the upper unit case is opened with respect to the lower unit case, the opening/closing linking unit moves from the distal end side toward the base end side with the first rotating member moving along the upper guide member by being slipped and with the second rotating member moving along the lower guide member by being slipped, and as the upper unit case is closed with respect to the lower unit case, the opening/closing linking unit moves from the base end side toward the distal end side with the first rotating member moving along the upper guide member by being rotated and with the second rotating member moving along the lower guide member by being rotated, and as a user does not push down on the upper unit case, the opening/closing linking unit can be stopped at a certain position, and wherein the first rotating member and the second rotating member are disposed to rotate coaxially. a lower unit case; an upper unit case disposed above the lower unit case and configured to open and close with respect to the lower unit case; a hinge configured to connect the upper unit case to the lower unit case such that the upper unit case pivots with respect to the lower unit case a lower guide member disposed in the lower unit case and extending from a base end side toward a distal end side of the lower unit case; an upper guide member disposed in the upper unit case and extending from a base end side toward a distal end side of the upper unit case; and an opening/closing linking unit comprising a first rotating member, a second rotating member and a linking portion, the linking portion being configured to link the first rotating member and the second rotating member, wherein as the upper unit case is opened with respect to the lower unit case, the opening/closing linking unit moves from the distal end side toward the base end side with the first rotating member moving along the upper guide member by being slipped and with the second rotating member moving along the lower guide member by being slipped, and as the upper unit case is closed with respect to the lower unit case, the opening/closing linking unit moves from the base end side toward the distal end side with the first rotating member moving along the upper guide member by being rotated and with the second rotating member moving along the lower guide member by being rotated, and as a user does not push down on the upper unit case, the opening/closing linking unit can be stopped at a certain position, and wherein the first rotating member and the second rotating member are disposed to rotate coaxially.