Vehicle seat device

A vehicle seat device, comprising:

• a fixed base fixed to a structural body of a seat;
• a movable base pivotally coupled to the fixed base;
• a paddle pivotally coupled to the movable base;
• and
• an air pack inflated and deflated between the movable base and the paddle, wherein
• when a side airbag arranged in the seat is deployed, the expanding side airbag presses and pivots the movable base and allows for a deployment of the side airbag,
• the paddle is configured to change a seat support form when pressed and pivoted by the air pack,
• the movable base pivots about a first pivot axis relative to the fixed base,
• the paddle pivots about a second pivot axis relative to the movable base, and
• the first pivot axis and the second pivot axis are arranged at different locations.