The present paper proposes a theoretical design method for a transcavitating propeller. This method determines circulation distribution using a lifting line theory and a blade section using a lifting surface theory. The designed propeller has non-cavitating section near the root and supercavitating section near the tip, which are connected smoothly to each other. Eight propellers were designed and tested in a cavitation tunnel. The result showed that the present method designs a transcavitating propeller mostly within 5% accuracy of thrust.