| 摘要 |
A vibration isolator which is capable of stably opening and closing an orifice is provided at low manufacturing cost. A plunger 236 for opening and closing an idle orifice 252 is disposed in a manner that is slidably engaged with the inner wall surface of an orifice-forming member 222 . A shaft portion 262 extending downward is formed in the central portion of the plunger 236 . A convex portion which is formed with a through-hole in which the shaft portion 262 is slidably is provided on the bottom of the orifice-forming member 222 so as to provide a bearing portion 266 . The shaft portion 262 of the plunger 236 and the bearing portion 266 of the orifice-forming member 222 constitute a guide member for guiding the reciprocating motion of this plunger 236.
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