To prevent the shaft strength from lowering without damaging the surface of a rotating shaft, certainly sealing the gap between a through hole to pass through the rotating shaft, installed in a bulk head and the rotating shaft with a seal member.

In a bulk head seal device, a lip 5a arranged around the circumference of the rotating shaft 2, and in contact with the periphery of the through hole 4 is installed in a seal member 5 in an elastically deformed state. The circumference of the through hole 4 which the lip 5a contacts and the peripheral part, or the part which at least the lip 5a directly contacts is subjected to quenching.