The insertion device (2) includes a main body (3) including a lens housing portion (3b) in which an intraocular lens (1) is housed and an insertion cylindrical portion (3a) for ejecting the lens into the eye through its front end opening (3j), a pushing shaft (4) configured to move the lens from the lens housing portion to push out the lens into the eye through the insertion cylindrical portion, and a liquid flow path (10) configured to cause liquid filled in an inside of the main body to flow from the inside of the main body to an outside thereof, the liquid flow path not including the front end opening (3j). The pushing shaft includes a structure configured to shut off the liquid flow path after the lens is ejected from the front end opening and thereby flow of the liquid through the front end opening is allowed.
