A multipurpose opening and closing device, comprising: a casing having an opening formed therein; a manipulation unit moved up and down in the casing by a user's manipulation; and an opening and closing unit operated in conjunction with an up-and-down movement of the manipulation unit to open or close the opening, wherein the opening and closing unit comprises: a moving member rotated as the manipulation unit is moved up and down; a connecting member rotatably connected with the moving member; and a door connected with the connecting member to open or close the opening as the connecting member rotates, characterized in that the manipulation unit comprises a manipulation body, a manipulation protrusion, a guide protrusion, and a bent protrusion, wherein the bent protrusion protrudes from a first side of the manipulation unit and is operated in conjunction with the opening and closing unit to rotate the opening and closing unit, and the manipulation protrusion protrudes from a second side of the manipulation unit to be exposed to an outside of the casing, so that the manipulation unit is moved up and down in the casing as a user manipulates the manipulation protrusion, and that the device further comprises a fixing unit provided in the casing to support the manipulation unit, wherein the fixing unit comprises a manipulation-protrusion fixing piece that is vertically formed on the moving course of the manipulation unit to receive the manipulation protrusion, and a guide-protrusion fixing piece that is vertically formed on the moving course of the manipulation unit to receive the guide protrusion protruding from the first side of the manipulation unit. a casing having an opening formed therein; a manipulation unit moved up and down in the casing by a user's manipulation; and an opening and closing unit operated in conjunction with an up-and-down movement of the manipulation unit to open or close the opening, wherein the opening and closing unit comprises: a moving member rotated as the manipulation unit is moved up and down; a connecting member rotatably connected with the moving member; and a door connected with the connecting member to open or close the opening as the connecting member rotates, characterized in that the manipulation unit comprises a manipulation body, a manipulation protrusion, a guide protrusion, and a bent protrusion, wherein the bent protrusion protrudes from a first side of the manipulation unit and is operated in conjunction with the opening and closing unit to rotate the opening and closing unit, and the manipulation protrusion protrudes from a second side of the manipulation unit to be exposed to an outside of the casing, so that the manipulation unit is moved up and down in the casing as a user manipulates the manipulation protrusion, and that the device further comprises a fixing unit provided in the casing to support the manipulation unit, wherein the fixing unit comprises a manipulation-protrusion fixing piece that is vertically formed on the moving course of the manipulation unit to receive the manipulation protrusion, and a guide-protrusion fixing piece that is vertically formed on the moving course of the manipulation unit to receive the guide protrusion protruding from the first side of the manipulation unit. a moving member rotated as the manipulation unit is moved up and down; a connecting member rotatably connected with the moving member; and a door connected with the connecting member to open or close the opening as the connecting member rotates, characterized in that the manipulation unit comprises a manipulation body, a manipulation protrusion, a guide protrusion, and a bent protrusion, wherein the bent protrusion protrudes from a first side of the manipulation unit and is operated in conjunction with the opening and closing unit to rotate the opening and closing unit, and the manipulation protrusion protrudes from a second side of the manipulation unit to be exposed to an outside of the casing, so that the manipulation unit is moved up and down in the casing as a user manipulates the manipulation protrusion, and that the device further comprises a fixing unit provided in the casing to support the manipulation unit, wherein the fixing unit comprises a manipulation-protrusion fixing piece that is vertically formed on the moving course of the manipulation unit to receive the manipulation protrusion, and a guide-protrusion fixing piece that is vertically formed on the moving course of the manipulation unit to receive the guide protrusion protruding from the first side of the manipulation unit.