A medical connector includes: a housing including a male connector connection portion comprising a male connector connection port having a cylindrical shape, a medical instrument connection portion, and a valve body housing portion; and a valve body configured to open and close the male connector connection port, the valve body including a head portion, and a barrel portion that connects to the head portion. When a male connector is inserted into the male connector connection port, the head portion moves from the male connector connection port into the valve body housing portion and a slit in the head portion opens, such that a flow passage from the male connector connection portion to the medical instrument connection portion is formed.