To prevent an occurrence of a leak from connection between inside and outside of a hard disk device, to reduce manufacturing man-hours and to improve manufacturability by forming a cover and a gasket member as one part while they are conventionally separate into two parts, in a gasket for a hard disk device.

A through hole 2 is arranged at a desired portion of a base cover 1 made from stainless steel and an elastic member 3 is inserted into the through hole 2 to project inward and outward of the base cover 1. An side of a disk device is sealed by the elastic member 3 projecting inward. Also, a lamination is formed by putting a metal base plate 5 through a resin vibration control member 4 on an outer side of the base cover 1 of which the elastic member 3 projecting.