Vibration isolator

A vibration isolator comprising:

• a first attachment member to be attached to one of a vibration generating unit or a vibration receiving unit;
• a second attachment member to be attached to another of the vibration generating unit or the vibration receiving unit;
• an elastic member that is provided at the second attachment member and elastically connects the first attachment member and the second attachment member;
• a convex portion protruded toward the first attachment member with reference to an outer surface of the elastic member opposed to the first attachment member;
• and
• a concave portion that is recessed in the same direction as a protruding direction of the convex portion,
• wherein the concave portion is formed as a void space at a region of the outer surface positioned on a base end side of the convex portion, that forms an extension portion at a side wall portion of the convex portion, and that forms an opposed face opposed to the extension portion.