Work vehicle, server device, load weight management system, and load weight management method

A work vehicle includes a working device which is configured to excavate and unload soil, a load meter which is configured to measure weight of the soil loaded by the working device, a transport vehicle specifier which is configured to specify a transport vehicle to be loaded with the soil, a vehicle weight acquirer which is configured to acquire vehicle weight information on loadable weight of the transport vehicle, a load weight calculator which calculates load weight of the soil loaded on the transport vehicle, according to the weight measured by the load meter, and an output unit which is configured to output information on a remaining loading capacity of the transport vehicle obtained from the vehicle weight information and the load weight.