A medical connector comprising: a first connector including a bar-shaped first male member capable of being in container; communication with a first container; a second connector including a bar-shaped second male member capable of being in communication with a second container; a tubular portion including a syringe connection portion that is configured to be in communication with a syringe; and a stopcock that is inserted into the tubular portion and is capable of rotation relative to the tubular portion, wherein a first hole, a second hole any a third hole that put the first male member and the tubular portion in communication are formed in the tubular portion, a liquid channel and a gas channel formed in the second male member are in communication with the tubular portion, a first channel, a second channel, and a third channel are formed in the stopcock, by rotating the stopcock, the position of the stopcock can be switched to a first rotation position at which the first channel puts the first hole and the syringe connection portion in communication, and a second rotation position at which the first channel puts the liquid channel and the syringe connection portion in communication, when the stopcock is at the second rotation position, the second hole and the gas channel of the second male member are in communication via the second channel, a first hydrophobic filter that allows passage of a gas and does not allow passage of a liquid is provided in a channel that connects the first male member and the gas channel and is formed when the stopcock is at the second rotation position, when the stopcock is at the second rotation position, the first male member and an inner cavity of the stopcock are in communication via the third hole and the third channel, an air supplying member capable of supplying a gas to the inner cavity of the stopcock is connected to the stopcock, and a second hydrophobic filter that allows passage of a gas and does not allow passage of a liquid is provided in a channel that connects the air supplying member and the first male member and is formed when the stopcock is at the second rotation position. a first connector including a bar-shaped first male member capable of being in container; communication with a first container; a second connector including a bar-shaped second male member capable of being in communication with a second container; a tubular portion including a syringe connection portion that is configured to be in communication with a syringe; and a stopcock that is inserted into the tubular portion and is capable of rotation relative to the tubular portion, wherein a first hole, a second hole any a third hole that put the first male member and the tubular portion in communication are formed in the tubular portion, a liquid channel and a gas channel formed in the second male member are in communication with the tubular portion, a first channel, a second channel, and a third channel are formed in the stopcock, by rotating the stopcock, the position of the stopcock can be switched to a first rotation position at which the first channel puts the first hole and the syringe connection portion in communication, and a second rotation position at which the first channel puts the liquid channel and the syringe connection portion in communication, when the stopcock is at the second rotation position, the second hole and the gas channel of the second male member are in communication via the second channel, a first hydrophobic filter that allows passage of a gas and does not allow passage of a liquid is provided in a channel that connects the first male member and the gas channel and is formed when the stopcock is at the second rotation position, when the stopcock is at the second rotation position, the first male member and an inner cavity of the stopcock are in communication via the third hole and the third channel, an air supplying member capable of supplying a gas to the inner cavity of the stopcock is connected to the stopcock, and a second hydrophobic filter that allows passage of a gas and does not allow passage of a liquid is provided in a channel that connects the air supplying member and the first male member and is formed when the stopcock is at the second rotation position.