A medical connector (1, 1') comprising: a cap having a male connector connecting part; a holder having a medical instrument connecting part; and a valve body for blocking the male connector connecting part, the valve body being configured to be pushed in by a male connector and a liquid flow channel in the male connector being made to communicate with a liquid flow channel in the medical instrument connecting part when the male connector is connected to the male connector connecting part, wherein the cap and the holder are linked to each other so as to be rotatable about an axis of the male connector connecting part, wherein the cap has a cylindrical outer peripheral wall part linked to the holder so as to be rotatable about the axis of the male connector connecting part, wherein fitting parts that link the cap to the holder so as to be rotatable about the axis of the male connector connecting part are formed between an inner peripheral surface of a lower end portion of the outer peripheral wall part and the holder, characterized in that the holder has an inner peripheral wall part disposed at an inner peripheral side of the outer peripheral wall part, the medical connector (1, 1') includes a sealing member that prevents a liquid from flowing into a portion between a first peripheral region portion of the inner peripheral wall part and the outer peripheral wall part, and a liquid communication channel that makes the liquid flow channel in the male connector communicate with the liquid flow channel in the medical instrument connecting part when the male connector is connected to the male connector connecting part is formed between a second peripheral region portion of the inner peripheral wall part, excluding the first peripheral region portion, and the outer peripheral wall part, by interposing the aforementioned elastic wall between the first peripheral region portion of the inner peripheral wall part and the outer peripheral wall part without a gap therebetween, a liquid is prevented from flowing into a portion between the first peripheral region portion and the outer peripheral wall part, a cavity part that makes the liquid communication channel formed between the second peripheral region portion of the inner peripheral wall part and the outer peripheral wall part communicate with the liquid flow channel in the medical instrument connecting part is formed underneath the recessed part bottom wall, and a recessed bottom part is formed at a lower portion of the inner peripheral wall part, and the inner peripheral wall part and the recessed part bottom wall form a housing recessed part in which the valve body is disposed. a cap having a male connector connecting part; a holder having a medical instrument connecting part; and a valve body for blocking the male connector connecting part, the valve body being configured to be pushed in by a male connector and a liquid flow channel in the male connector being made to communicate with a liquid flow channel in the medical instrument connecting part when the male connector is connected to the male connector connecting part, wherein the cap and the holder are linked to each other so as to be rotatable about an axis of the male connector connecting part, wherein the cap has a cylindrical outer peripheral wall part linked to the holder so as to be rotatable about the axis of the male connector connecting part, wherein fitting parts that link the cap to the holder so as to be rotatable about the axis of the male connector connecting part are formed between an inner peripheral surface of a lower end portion of the outer peripheral wall part and the holder, characterized in that the holder has an inner peripheral wall part disposed at an inner peripheral side of the outer peripheral wall part, the medical connector (1, 1') includes a sealing member that prevents a liquid from flowing into a portion between a first peripheral region portion of the inner peripheral wall part and the outer peripheral wall part, and a liquid communication channel that makes the liquid flow channel in the male connector communicate with the liquid flow channel in the medical instrument connecting part when the male connector is connected to the male connector connecting part is formed between a second peripheral region portion of the inner peripheral wall part, excluding the first peripheral region portion, and the outer peripheral wall part, by interposing the aforementioned elastic wall between the first peripheral region portion of the inner peripheral wall part and the outer peripheral wall part without a gap therebetween, a liquid is prevented from flowing into a portion between the first peripheral region portion and the outer peripheral wall part, a cavity part that makes the liquid communication channel formed between the second peripheral region portion of the inner peripheral wall part and the outer peripheral wall part communicate with the liquid flow channel in the medical instrument connecting part is formed underneath the recessed part bottom wall, and a recessed bottom part is formed at a lower portion of the inner peripheral wall part, and the inner peripheral wall part and the recessed part bottom wall form a housing recessed part in which the valve body is disposed.