To provide a strut mount capable of reducing the weight and of intensifying the strength and having a good durability.

The strut mount comprises an inner cylinder 1, a vibration isolating base body 2 and a pair of upper and lower brackets 3 and 4. The lower bracket 3 is formed from aluminum alloy, and the lower bracket 3 is provided with a peripheral wall part 3a, a bottom wall part 3b and a first attachment flange 3d. The upper bracket 4 is provided with a second attachment flange 4a and a lid wall part 4b. The first attachment flange 3d is formed with a plurality of first through-holes 69 for insertion of a plurality of fitting members 5. The second attachment flange 4a is formed with a plurality of second through-holes 70 for insertion of a plurality of fitting members 5. Flange parts around the first through-holes 69 of the first attachment flange 3d bulge at their downside surfaces 72 to form respective thick part 73 in the flange part.