A connector comprising: a tubular male joint member; a liquid passage portion having a liquid passage space defined therein in fluid communication with an interior of said male joint member; a first female joint port and a second female joint port which are capable of receiving a tube; the connector further comprising: a first valve body having a head and a neck interconnecting said head and said liquid passage portion, said neck being thinner than said head, said first valve body having a slit extending from a top surface of said head to said liquid passage space, said first valve body being made of an elastic material; and a second valve body having a head and a neck interconnecting said head and said liquid passage portion, said neck being thinner than said head, said second valve body having a slit extending from a top surface of said head to said liquid passage space, said second valve body being made of an elastic material; wherein when a tube is connected to said first female joint port, said first valve body is deformed to open the slit of said first valve body to bring an interior of the tube and an interior of said male joint member into fluid communication with each other through the slit of said first valve body and said liquid passage space; and when a tube is connected to said second female joint port, said second valve body is deformed to open the slit of said second valve body to bring an interior of the tube and the interior of said male joint member into fluid communication with each other through the slit of said second valve body and said liquid passage space; characterized in that: the connector further comprising: a straight wall portion which defines a part of said liquid passage space and connects said slit of said first valve body and said slit of said second valve body. a tubular male joint member; a liquid passage portion having a liquid passage space defined therein in fluid communication with an interior of said male joint member; a first female joint port and a second female joint port which are capable of receiving a tube; the connector further comprising: a first valve body having a head and a neck interconnecting said head and said liquid passage portion, said neck being thinner than said head, said first valve body having a slit extending from a top surface of said head to said liquid passage space, said first valve body being made of an elastic material; and a second valve body having a head and a neck interconnecting said head and said liquid passage portion, said neck being thinner than said head, said second valve body having a slit extending from a top surface of said head to said liquid passage space, said second valve body being made of an elastic material; a first valve body having a head and a neck interconnecting said head and said liquid passage portion, said neck being thinner than said head, said first valve body having a slit extending from a top surface of said head to said liquid passage space, said first valve body being made of an elastic material; and a second valve body having a head and a neck interconnecting said head and said liquid passage portion, said neck being thinner than said head, said second valve body having a slit extending from a top surface of said head to said liquid passage space, said second valve body being made of an elastic material; wherein when a tube is connected to said first female joint port, said first valve body is deformed to open the slit of said first valve body to bring an interior of the tube and an interior of said male joint member into fluid communication with each other through the slit of said first valve body and said liquid passage space; and when a tube is connected to said second female joint port, said second valve body is deformed to open the slit of said second valve body to bring an interior of the tube and the interior of said male joint member into fluid communication with each other through the slit of said second valve body and said liquid passage space; the connector further comprising: a straight wall portion which defines a part of said liquid passage space and connects said slit of said first valve body and said slit of said second valve body. a straight wall portion which defines a part of said liquid passage space and connects said slit of said first valve body and said slit of said second valve body.