A gas supply system has a chamber, a front manifold, a circulation pipe, and a fusible plug valve. The chamber stores hydrogen gas. The front manifold is connected to the chamber, and hydrogen gas flows through the front manifold. The circulation pipe is provided such that hydrogen gas can flow through the front manifold, and has higher thermal conductivity than the chamber. The fusible plug valve is provided in the front manifold apart from the chamber. Heat is transferred to the fusible plug valve from the circulation pipe. The fusible plug valve discharges the hydrogen gas in the chamber and the hydrogen gas in the front manifold to the outside by being opened at a temperature equal to or higher than a predetermined opening temperature.