WEIGHT ESTIMATION SYSTEM

Provided is a weight estimation system (S) including: a change amount calculation device () which acquires a height of a loading platform (N) before loading a vehicle and a height of the loading platform (N) after loading the vehicle and calculates an amount of change between the heights of the loading platform (N) between before and after the loading; and a loaded weight estimation device () which estimates a loaded weight on the basis of a correlation between the amount of change and a loaded weight stored in advance.