The present invention provides a technique for treating the cornea. More specifically, the present invention is an agent for the treatment or prevention of a state of corneal endothelial disease, the agent including at least one factor selected from the group consisting of laminin and fragments thereof, wherein the problem is solved by also providing a technique characterized in that this agent is administered together with corneal endothelial cells. Specifically, the present invention can include laminin 511 (a5ß1?1), laminin 521 (a5ß2?1), or a fragment of these.
