A driving support device comprising: a steering control unit (10, 50, 51, 52, 70, 71, 72) for performing a steering control for changing a steering angle of an own vehicle in such a manner that the own vehicle travels along a target path (Ld); a deceleration unit (10, 20, 21, 22, 30, 31, 32, 70, 71, 72) for performing a deceleration control for decelerating the own vehicle while the steering control unit is performing the steering control (Step 760); and a steering torque detection unit (10, 11, Step 505) for detecting a steering torque (Tra), the steering control unit configured to start a first alert to a driver (Step 670) and to continue performing the steering control (Step 625), when a state in which holding state information does not satisfy a predetermined first condition (Step 515, "Yes" at Step 520, Step 810, "Yes" at Step 815) continues for a first time threshold (T1th) or more (time point t2, "Yes" at Step 640, Step 650) while the steering control unit is performing the steering control, the holding state information including information indicative of the steering torque detected by the steering torque detection unit and representing a holding state of a steering handle of the own vehicle by the driver; and the deceleration unit configured to start the deceleration control (Step 760) when a state in which the holding state information does not satisfy a predetermined second condition ("Yes" at Step 520, Step 550, "Yes" at Step 815, Step 820) continues for a second time threshold or more (a time point t4, "Yes" at Step 730, Step 745) after a predetermined time point which is after a time point (a time point t3, "Yes" at Step 665, and Step 680) at which the steering control unit starts the first alert (the time point t2), the predetermined second condition being a condition satisfied when the holding state information indicates that the driver holds the steering handle more firmly than when the holding state information satisfies the first condition; characterised in that the steering control unit is configured to determine that the holding state information does not satisfy the first condition, when the steering torque is equal to or smaller than a predetermined first torque threshold(Tr1th) (Step 515, "Yes" at Step 520), and the deceleration unit is configured to determine that the holding state information does not satisfy the second condition, when the steering torque is equal to or smaller than a predetermined second torque threshold (Tr2th) which is greater than the first torque threshold ("Yes" at Step 520, Step 550). a steering control unit (10, 50, 51, 52, 70, 71, 72) for performing a steering control for changing a steering angle of an own vehicle in such a manner that the own vehicle travels along a target path (Ld); a deceleration unit (10, 20, 21, 22, 30, 31, 32, 70, 71, 72) for performing a deceleration control for decelerating the own vehicle while the steering control unit is performing the steering control (Step 760); and a steering torque detection unit (10, 11, Step 505) for detecting a steering torque (Tra), the steering control unit configured to start a first alert to a driver (Step 670) and to continue performing the steering control (Step 625), when a state in which holding state information does not satisfy a predetermined first condition (Step 515, "Yes" at Step 520, Step 810, "Yes" at Step 815) continues for a first time threshold (T1th) or more (time point t2, "Yes" at Step 640, Step 650) while the steering control unit is performing the steering control, the holding state information including information indicative of the steering torque detected by the steering torque detection unit and representing a holding state of a steering handle of the own vehicle by the driver; and the deceleration unit configured to start the deceleration control (Step 760) when a state in which the holding state information does not satisfy a predetermined second condition ("Yes" at Step 520, Step 550, "Yes" at Step 815, Step 820) continues for a second time threshold or more (a time point t4, "Yes" at Step 730, Step 745) after a predetermined time point which is after a time point (a time point t3, "Yes" at Step 665, and Step 680) at which the steering control unit starts the first alert (the time point t2), the predetermined second condition being a condition satisfied when the holding state information indicates that the driver holds the steering handle more firmly than when the holding state information satisfies the first condition; characterised in that the steering control unit is configured to determine that the holding state information does not satisfy the first condition, when the steering torque is equal to or smaller than a predetermined first torque threshold(Tr1th) (Step 515, "Yes" at Step 520), and the deceleration unit is configured to determine that the holding state information does not satisfy the second condition, when the steering torque is equal to or smaller than a predetermined second torque threshold (Tr2th) which is greater than the first torque threshold ("Yes" at Step 520, Step 550).