A medical device for applying a sheet-shaped delivery object to a target site, the medical device including a main body having an elongated shaft portion and a holding portion provided at a distal end of the shaft portion for holding the sheet-shaped delivery object, and an elongated sliding body that slides on the holding portion, in which the sheet-shaped delivery object on the holding portion can be slidably moved to the target site by sliding the sheet-shaped delivery object while being pressed by the sliding body.