Patent ID: 8470145

Claim:
A cathode unit comprising: a holder having formed on one surface thereof a plurality of recessed portions, the holder being adapted to receive in each of the plurality of the recessed portions a target member of a bottomed cylindrical shape from the bottom side thereof; and magnetic field generating means for generating a magnetic field in a space inside the target member or each of the target members placed in the recessed portions, wherein the plurality of the recessed portions are each formed in an identical opening diameter throughout an entire surface of the holder at a predetermined distance from each other, wherein the magnetic field generating means is made up of bar-shaped magnets which are disposed in a depth direction of the recessed portions on a line connecting the center of each of the recessed portions adjoining each other, and wherein the holder has, on a surface lying opposite to the surface in which the recessed portions are formed, housing holes capable of housing therein the magnets.