Provided is a protection device for a vehicle electrical component capable of preventing damage to a predetermined electrical component due to hitting by a battery, and also capable of reducing noise/vibration. The disclosure is a protection device which protects a starter in a vehicle in which a battery and the starter are disposed to face each other with a space therebetween in an engine room of the vehicle in which components constituting a power plant or a power train are supported by a vehicle body via a mount and a bracket. The skid block serving as the protection device includes bracket attachment portions attached to a transmission attachment portion of the bracket, and a skid block main body extending upward from the bracket attachment portions and gradually away from the bracket extension portion, and having a distal end portion positioned between the battery and the starter and facing the battery.