Vibration damping device

A vibration damping device, comprising:

• a vulcanized rubber molding having a vibration isolating function;
• and
• a resin molding integrally formed with the vulcanized rubber molding and capable of being fixed to a base body while supporting the vulcanized rubber molding,
• wherein the resin molding includes a sandwiched molding having a core layer and skin layers respectively formed on a surface of the core layer and sandwiching the core layer,
• wherein a polyamide resin composition (A) included in the skin layers includes a polyamide resin (a) and glass fibers (x), and a blend ratio (a/x) between the polyamide resin (a) and the glass fibers (x) is in a range of 40/60 to 75/25 in mass ratio,
• wherein a polyamide resin composition (B) included in the core layer includes a polyamide resin (b) and the glass fibers (y), and a blend ratio (b/y) between the polyamide resin (b) and the glass fibers (y) is in a range of 35/65 to 60/40 in mass ratio, and
• wherein a melt viscosity ηa of the polyamide resin composition (A) to be measured under conditions of a temperature 30° C. higher than the melting point of the polyamide resin composition (A) and a shearing speed of 1000 s−1 and a melt viscosity ηb of the polyamide resin composition (B) to be measured under conditions of a temperature 30° C. higher than the melting point of the polyamide resin composition (B) and a shearing speed of 1000 s−1 satisfy a relational expression of
• 1<(log ηa/log ηb)<1.4.