PURPOSE: To facilitate manufacture by providing an electrical connection part keeping designated envelope dimensions, and providing a required valve move ment response time.

CONSTITUTION: In a sandwich pneumatic valve 1 of an ISO I having an electric connector shaped like an ISO plug 10, spool hole 12 is provided to connect a solenoid end of a valve body and a spool hole 11 to each other. The diameter of the spool hole 12 is selected to be convenient to manufacture of the valve and manufacture the spool hole 11 during initial assembling, and assemble the valve spool in the hole 11. At the respective ends, a transition spool 25 including a radial seal for sealing the valve spool hole area from a connector passage in cooperation with the spool hole 12 and a pneumatic operation passage 27 is inserted in the spool hole 12.