SUPPORT DEVICE

A support device is a support device by which a support operation to support a host vehicle to stop is performable. The support device includes: a determination unit configured to, when a light color of a traffic light is a light color that requires the host vehicle to stop, determine whether or not alerting on the traffic light is performed as the support operation, based on a speed of the host vehicle and a distance from a current position of the host vehicle to a stop reference position; and a recognition unit configured to recognize a surrounding state around the host vehicle. The stop reference position in a case where a crossing pedestrian is recognized by the recognition unit is closer to the host vehicle than the stop reference position in a case where no pedestrian is recognized by the recognition unit.