Provided is a gas supply system for supplying hydrogen to a vehicle, the vehicle including: a tank loaded with a hydrogen storage alloy, storing and releasing hydrogen; and a thermal medium distribution unit attached to the tank and configured such that a thermal medium for heating or cooling the hydrogen storage alloy is distributable from outside, includes: a reservoir reserving hydrogen at a pressure of 0.2 MPa or greater and less than 3.0 MPa; a hydrogen flow path connectable to the vehicle for supplying hydrogen from the reservoir to the tank; a cooling medium reservoir reserving the thermal medium for cooling; and a thermal medium flow path connectable to the vehicle for distributing the thermal medium to the thermal medium distribution unit in the vehicle, in which the hydrogen flow path and the thermal medium flow path are combined at least at an end portion connectable to the vehicle.