To provide a propulsion structure of a twin-screw vessel, enhanced in propulsion performance.

This propulsion structure includes: a first propeller structure 2-1 installed on a hull 6; and a second propeller structure 2-2 installed on the hull. Each includes: bossings 3-1, 3-2 extending rearward from a vessel bottom; propeller shafts 9-1, 9-2 rotatably supported by the bossing, and extended rearward; and propellers 4-1, 4-2 installed on the propeller shafts so as to generate a propulsion force accompanied by the rotation of the propeller shafts. At least one of the first propeller structure and the second propeller structure further includes: bearings 8-1, 8-2 arranged at rear of the propellers so as to support the propeller shafts; and bearing supports installed on the vessel bottom so as to support the bearings. The bearing supports are configured so as to generate a lift force with a forward directional component while receiving the water current of the propellers.