PURPOSE: To eliminate the generation of noise to a vehicular load detecting valve heretofore with noise generated sometimes during operation.

CONSTITUTION: The base part of an arm 11 with the tip connected to suspension mechanism is rotatably fitted to a body 5 fitted to the cross member of a chassis frame. The tip of the push rod 10 of a valve 4 provided at the body 5 is engaged with the intermediate part of the arm 11, and the periphery of the push rod 10 is covered with a boot 19 made of rubber or the like. In such a load detecting valve sealing device for a vehicle, the upper part of the boot 19 is extended so that the extended part covers the whole tip part 10a of the push rod 10 and pierces the hole 13 of the arm 11 so as to be engaged with the arm 11. Accordingly, even if the arm 11 comes in contact with the push rod 10 during operation, noise is not generated since the boot 19 is interposed between the arm 11 and the push rod 10.