To make it possible to manufacture an integrally constituted pressure control valve and obtain large quantities by manufacture lots by boring an insertion hole in the area of the outside end part of a control nozzle and inserting a connection member as an insert body into the insertion hole tightly.

The control nozzle 10 has a 1st end surface with a valve seat 18 formed at its inner end facing a closing body 8 and also has an outside end part 20 formed as a 2nd end surface at the outer end on the opposite side from the closing body 8 projecting from a valve casing 4. Then, the body is extended to a connection hole 22 through the control nozzle 10 and it is made possible to guide this connection hole 22 to the outside end part 20 from the valve seat 18, thereby constituting the control nozzle 10 in one body. The insertion hole 30 is bored in the area of the outside end part 20 of the control nozzle 10 and the connection member 33 is inserted tightly into the insertion hole 30. Consequently, the integrally constituted pressure control valve can be manufactured.