The piping connector 1, wherein the inner periphery of the socket is provided with a first diameter contracted portion and {TAIL ~ a second diameter contracted portion}, and a stepped portion for constituting a stopper and a burr stopper in welding {HEAD ~ the hold ring} is formed between the first diameter contracted portion and the second diameter contracted portion 
The piping connector 1 , wherein the inner periphery of the socket is provided with a first diameter contracted portion and { TAIL ~ a second diameter contracted portion } , and a stepped portion for constituting a stopper and a burr stopper in welding { HEAD ~ the hold ring } is formed between the first diameter contracted portion and the second diameter contracted portion
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