Lane departure suppression device

A lane departure suppression device comprising:

• a vehicle position detection device that detects a position of a vehicle with respect to a lane;
• and
• a control unit that executes a lane departure suppression control that is at least one of automatically steering a steering wheel and issuing a warning when the control unit determines that there is a possibility that the vehicle departs from the lane based on the position of the vehicle detected by the vehicle position detection device,
• wherein the control unit is configured to not execute the lane departure suppression control when the control unit determines that a lateral speed and a lateral acceleration of the vehicle with respect to the lane in which the vehicle is traveling are increased within a predetermined time from a time point at which acceleration and deceleration of the vehicle is started, and that there is an adjacent lane on a side with respect to the lane in a direction in which the lateral speed and the lateral acceleration of the vehicle are increased.