PURPOSE: To provide a fluid coupling capable of easily constituting a fluid circuit for crossing the flow of fluid.

CONSTITUTION: A first flow port 30 and a second flow port, communicated with a closed chamber 20 to be opened in the same direction, are formed on a coupling main body 1 for forming the closed chamber 20. A second connection port 48 and a first connection port, opened in the reverse direction to the first flow port 30 and the second flow port, are formed coaxially with the first flow port 30 and the second flow port respectively while communicated with the closed chamber 20. Also the first connection port and the second connection port 48 are formed at an interval same as that between the gas inflow and outflow ports of a gas meter. Moreover, a twisted wall 61, for partitioning the closed chamber 20 into first and second passages 58 and 60 communicating between the first flow port 30 and the first connection port and between the second flow port and the second connection port 48 respectively, is formed on the coupling main body 1 so as to cross the flow of liquid.