A driving support device that controls a steering unit such that a hitch angle between a tow vehicle, which tows a towed vehicle, and the towed vehicle becomes a target angle set as a target includes: an image control unit that causes a display unit to perform display of a captured image obtained by an imaging unit provided in the tow vehicle or the towed vehicle in a mirror image state and display of a setting image including a slider indicating the target angle input through an input unit; an acquisition unit that acquires input of the target angle at the time of backward movement of the tow vehicle from the input unit, in a state where the setting image is displayed; and a setting unit that sets the target angle based on the input.