A medical connector includes: a male connector portion that is connectable to a closed female connector portion of another medical connector, the closed female connector portion comprising an opening formed on a top wall, and a valve body blocking the opening and having a slit, an outer peripheral edge portion of the valve body being secured to the top wall wherein the male connector portion includes: a tubular body having an outer diameter equal to or less than a length that is twice a distance between a center of a top surface of the valve body and an end of the slit that is radially furthest from the center, the tubular body being insertable into the slit, a limiting portion configured to limit an insertion depth of the tubular body, a sealing portion configured to surround the slit, and a locking portion.
