To provide a pipe joint that safely performs connecting or disconnecting operation.

The pipe joint includes a cylindrical housing 16, a first locking member 18, a pressing member 24, a valve member 30, and a second locking member 50 provided between the valve member 30 and the pressing member 24. When the housing is communicated with a fluid source when the pressing member 24 is in a standby position (Fig.1, Fig.2, Fig.3 (not shown), or Fig.4 (not shown)), the second locking member is displaced by the valve member which is displaced toward an opening position by fluid pressure, but it engages with the pressing member 24 before the valve member gets to the opening position (Fig.2), thereby preventing the valve member from getting to the opening position and the pressing member from being displaced to a pressing position. When the housing is communicated with the fluid source when the pressing member 24 is in the pressing position (Fig.4 (not shown)), the second locking member permits the valve member to be displaced to the opening position without being engaged with the pressing member.