A drive assist device includes: a overhead image generating unit that generates a vehicle periphery overhead image; a forward trajectory setting unit that sets a forward trajectory serving as an expected trajectory in the travel direction of the vehicle occurring when the turning based on a calculated steering angle; a reverse trajectory setting unit that sets a reverse trajectory serving as an expected trajectory in the travel direction of the vehicle or in the opposite direction as the travel direction of the vehicle occurring when turning based on a steering angle in the opposite direction as the calculated steering angle; and a image synthesizing unit that generates a drive assist overhead image for display in a monitor by synthesizing the forward trajectory and the reverse trajectory with the vehicle periphery overhead image.