Who built the first production car?

There's no single definitive answer to who built the *first* production car, as it depends on how you define "production" and "car." However, the Benz Patent-Motorwagen, built by Karl Benz in 1886, is generally considered the first practical automobile to be produced in a small series. While only a few were initially built, it marked a significant step towards mass production and the modern automobile.