A capping sheet that seals a nozzle surface of a liquid jet head having a liquid jet nozzle that ejects liquid onto a target, the capping sheet includes: a sheet body including an opposite surface facing the nozzle surface of the liquid jet head, the sheet body being provided separately from a capping-sheet carrying mechanism that carries the sheet body from a non-capping position where the opposite surface does not face the nozzle surface to a capping position where the opposite surface faces the nozzle surface; and on the opposite surface, a sealing part that seals the nozzle surface with a sealed space therebetween if the capping sheet is carried to the capping position by the capping-sheet carrying mechanism and relatively moved in a way that the opposite surface comes close to the nozzle surface at the capping position.