Fluid coupling

[Problems] To provide a low pressure loss type fluid coupling having a valve holder which has a large effective opening area and never drops the strength thereof. [Means to Solve] In the fluid coupling for connecting the fluid passages of the plug 1 and the socket 2, a valve 33, a valve holder 31 and a spring 32 disposed in a compressed state between the valve 33 and the valve holder 31 are accommodated inside each of a plug 1 and a socket 2 to be connected to each other liquid-tightly, and when the plug 1 is inserted into the socket 2, the valve 33 of the plug 1 and the valve 33 of the socket 2 make contact with each other so that the valves 33 are retracted resisting an urging force of the spring32. This fluid coupling further includes conical members 32, 51 which form a conical external shape along a line connecting the outside diameter portion of the valve 33 and the outside diameter portion of the valve holder 31 when the valve 33 of the plug 1 and the valve 33 of the socket 2 make contact with each other, so that the springs 32 are compressed between the valve 33 and the valve holder 31.