A vibration transducer includes a silicon substrate, a first oxide film formed on the silicon substrate, an activation layer formed on the first oxide film, a second oxide film formed on the activation layer, a polysilicon layer formed on the second oxide film, and a substrate contact part. A vibrator, a vibrator electrode electrically conducted with the vibrator, a fixed electrode close to the vibrator and a vacuum chamber configured to surround the vibrator are formed in the activation layer. The polysilicon layer forms a shell. The substrate contact part is configured to electrically conduct the polysilicon layer and the silicon substrate, and is formed to continuously surround the vacuum chamber in a region, in which the vibrator, the vibrator electrode and the fixed electrode of the activation layer are not formed, of the activation layer.