Occupant protection device

An occupant protection device comprising:

• a base portion fixed to a ceiling portion of a vehicle;
• an operation portion connected to the base portion via a hinge and configured to move back and forth between a first position serving as an initial position and a second position used to suppress movement of an occupant when inertial force acts on the occupant, the operation portion configured to align with the ceiling portion at the first position, the operation portion configured to support the occupant at the second position;
• and
• a control circuitry configured to perform movement control to move the operation portion from the first position to the second position in a case of detecting a signal indicating that the vehicle suddenly decelerates or inertial force acts on the occupant and causes the occupant to move, wherein
• the operation portion is movable repeatedly from the first position to the second position through the movement control by returning to the first position after having moved from the first position to the second position, and
• the occupant protection device further includes a buffer provided between the base portion and the operation portion, the buffer selected from the group consisting of a damper device, an elastic member and a linear motor, wherein the buffer is configured to buffer a collision impact on the occupant against the operation portion when the operation portion moves to the second position,
• wherein the control circuitry is configured to control adjustment of reaction force associated with the inertial force acting on the occupant by the buffer, in accordance with a velocity of the vehicle, a weight of the occupant, or a velocity of the occupant toward the operation portion in a case where the inertial force acts.