A driving support device comprising: an object detecting unit (20, 10, Step 604) configured to detect an object which is present around an own vehicle; an accelerator operation amount detecting unit (21, 10) configured to acquire an operation amount of an accelerator on which a driver performs an operation for accelerating the own vehicle; a velocity detecting unit configured to detect a vehicle velocity which is a velocity of the own vehicle; and a pre-collision control performing unit (10, 30, 31, 32, 34, 36, 38) configured to perform a pre-collision control to prevent a collision between the own vehicle and the object when a control start condition is satisfied, the control start condition being a condition satisfied when a collision index value correlating with a probability of the collision between the own vehicle and the object and an index value threshold satisfy a predetermined relationship; the pre-collision control performing unit configured to: acquire a velocity threshold corresponding to a region in which the own vehicle travels, based on information to specify the region; and start to perform the pre-collision control if an allowance condition has been satisfied before a timing at which the control start condition becomes satisfied, the allowance condition being a condition that the accelerator operation amount is equal to or greater than an operation amount threshold and the vehicle velocity is equal to or lower than the acquired velocity threshold; and the pre-collision control performing unit configured not to: perform the pre-collision control if the allowance condition has not been satisfied before the timing at which the control start condition becomes satisfied. an object detecting unit (20, 10, Step 604) configured to detect an object which is present around an own vehicle; an accelerator operation amount detecting unit (21, 10) configured to acquire an operation amount of an accelerator on which a driver performs an operation for accelerating the own vehicle; a velocity detecting unit configured to detect a vehicle velocity which is a velocity of the own vehicle; and a pre-collision control performing unit (10, 30, 31, 32, 34, 36, 38) configured to perform a pre-collision control to prevent a collision between the own vehicle and the object when a control start condition is satisfied, the control start condition being a condition satisfied when a collision index value correlating with a probability of the collision between the own vehicle and the object and an index value threshold satisfy a predetermined relationship; the pre-collision control performing unit configured to: acquire a velocity threshold corresponding to a region in which the own vehicle travels, based on information to specify the region; and start to perform the pre-collision control if an allowance condition has been satisfied before a timing at which the control start condition becomes satisfied, the allowance condition being a condition that the accelerator operation amount is equal to or greater than an operation amount threshold and the vehicle velocity is equal to or lower than the acquired velocity threshold; and the pre-collision control performing unit configured not to: perform the pre-collision control if the allowance condition has not been satisfied before the timing at which the control start condition becomes satisfied. acquire a velocity threshold corresponding to a region in which the own vehicle travels, based on information to specify the region; and start to perform the pre-collision control if an allowance condition has been satisfied before a timing at which the control start condition becomes satisfied, the allowance condition being a condition that the accelerator operation amount is equal to or greater than an operation amount threshold and the vehicle velocity is equal to or lower than the acquired velocity threshold; and the pre-collision control performing unit configured not to: perform the pre-collision control if the allowance condition has not been satisfied before the timing at which the control start condition becomes satisfied.