A gyroscopic roll stabilizing device for a marine vehicle includes a base communicating with a gyroscopic component which includes a rotor rotatable about an axis, a motor for rotating the rotor about the axis, a swing container swinging about a swing axis and having the rotor communicating thereto, a first support member and a second support member being opposite to the first support member for swingingly supporting the swing container. An actuating member rotates the gyroscopic component about an axis around which the rotor does not swing in its free state.