| 摘要 |
A clamp mechanism 35 holding an object W to be processed placed on a susceptor 22 in a processing vessel 16 for film formation which can be vacuumed, includes a ring-shaped clamp ring body 38 contacting a peripheral portion of the object to be processed, and an urging member 40 for urging the clamp ring body downwardly. A contact surface 38A on an inner peripheral side of the clamp ring body is formed as a tapered surface which is inclined at a predetermined angle theta downwardly from the horizontal line outward in the direction of the diameter of the object to be processed. The predetermined angle is set in a range from 2 to 15 degrees, and the amount of overlap between the contact surface and the peripheral edge portion of the object to be processed is set in a range from 0.7 to 3.5 mm. Thus, formation of an unnecessary deposition film in the vicinity of the peripheral portion of the object to be processed and the side surface thereof is properly restricted.
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