The present disclosure relates to a vacuum interrupter that is installed within a vacuum circuit breaker to break a circuit. The vacuum interrupter includes an insulated container, a seal cup, a fixing electrode, a diaphragm, and a movable electrode. The insulated container is formed in a cylindrical form. The seal cup is installed on an upper end of the insulated container. The fixing electrode includes a fixing shaft and a fixing contact member installed on the other end of the fixing shaft. The diaphragm is installed on a lower end of the insulated container. The movable electrode includes a movable shaft having one end fixed to the diaphragm and the other end disposed within the insulated container and formed to be linearly movable, and a movable contact member installed on the other end of the movable shaft to be selectively contacted to the fixing contact member.