A drive assist device includes an object detection unit that is configured to detect an object in front of a host vehicle, a curve detection unit that is configured to detect a curved path in front of the host vehicle, a collision determination unit that is configured to determine a collision between the host vehicle and the object, and in a case where the curved path is detected, makes it difficult to determine the object detected in the direction opposite to the curving direction as an obstacle compared to an object detected in the curving direction, and a collision determination unit that is configured to perform a collision avoidance assist on the host vehicle in a case where it is determined that the host vehicle and the obstacle may collide with each other.