PURPOSE: To obtain an automatic simultaneous connecting device for a plurality of pipes which can dispose of the frequent selection of plural kinds of pipes free from the trouble of separation of pipes by installing a valve body which is connected and disconnected with the valve seats installed at a plurality of pipe edge parts by an individual operating means and installing a flange connecting/disconnecting means having an engagement hook on one flange.

CONSTITUTION: A valve body 6 contacts and separates from a valve seat 5, and bent pipes 3 and 31 connected with a plurality of fluid feeding pipes 2 and 21 of the transfer side equipment A are integrally installed on an upper part flange 1. Springs 35 and 35' with which a plurality of pipes of the fixed side equipment B are connected energize two engagement hooks 34, 341 and 34', 341' in back to back form in closure direction and are connected with a lower part flange 15. Then, the lower part flange 15 is raised to closely contact the upper part flange 1, and the valve bodies 6 and 24 are separated from the valve seats 5 and 21, and then the bent pipes 3 and 31 and bent pipes 19 and 191 communicate with each other, and the fluid of the transfer side equipment A is supplied into the fixed side equipment B. Further, the flanges 1 and 15 are tightened by the turn of a clamping hook 42.