Provided is a seat in which a physical quantity can be controlled according to a physique of an occupant. One aspect of the present disclosure provides a seat including a seat body that supports a body of an occupant, at least one driving device that changes a physical quantity of the seat body, and a controller that controls the at least one driving device. The controller includes a model generator that generates a human body model of the occupant, an analyzer that analyzes a state quantity of the human body model, and an instructing device that drives the at least one driving device based on a result of an analysis by the analyzer.