Anti-vibration device

A liquid-sealed type anti-vibration device comprising:

• a cylindrical first mounting member connected to either one of a vibration generating portion and a vibration receiving portion, and a second mounting member connected to the other;
• an elastic body elastically connecting both the mounting members to each other;
• and
• a partition member that partitions a liquid chamber in the first mounting member in which a liquid is sealed into a first liquid chamber and a second liquid chamber,
• wherein a restriction passage that is configured to cause the first liquid chamber and the second liquid chamber to communicate with each other is formed in the partition member,
• the restriction passage includes a first communication portion that is open to the first liquid chamber, a second communication portion that is open to the second liquid chamber, and a main body flow path that is configured to cause the first communication portion and the second communication portion to communicate with each other,
• the main body flow path extends in a circumferential direction around a central axis of the first mounting member,
• in a portion of the main body flow path connected to at least one of the first communication portion and the second communication portion, a guide portion that is configured to guide the liquid from the other of the first communication portion and the second communication portion to an opposed surface that is opposed to one of the first communication portion and the second communication portion in an inner surface of the restriction passage is disposed,
• between the main body flow path and at least one of the first communication portion and the second communication portion, a diffusion chamber that has the opposed surface in a portion of a wall surface of the diffusion chamber and is configured to cause the liquid that has passed through the guide portion from the other of the first communication portion and the second communication portion to be diffused is disposed, and
• a planar area of the opposed surface is larger than a flow path cross-sectional area of the main body flow path.