Patent ID: 7959254

Claim:
A cap unit of a liquid ejection apparatus, the liquid ejection apparatus including a liquid ejection head having a nozzle-forming surface in which nozzle for ejecting liquid is formed, the cap unit comprising: a cap that is capable of contacting the liquid ejection head in such a manner as to encompass the nozzle; a member installed in the cap, the member having a hole; and an installation device that is inserted in the cap to install the member in the cap, the installation device being made of metal and including: a holding portion that is displaced to hold the member in the cap; and a fixing portion that is displaced to fix the installation device to the cap at the time of the insertion of the installation device to the cap in a state where the holding portion holds the member, wherein in a state where the installation device is inserted to the cap, the holding portion and the fixing portion are located inside of the cap compared with an upper surface of the member installed in the cap, and wherein the cap includes a portion to which the fixing portion is locked, the portion being non-deformable.