A damper device, wherein when a rotary shaft having wing portions projected therefrom is rotated in a cylinder in one direction, a check valve is operated to apply a proper braking force thereto and when the rotary shaft is rotated in the other direction, the check valve is not operated to apply a slight braking force thereto. “a movement restricting flow passages for restricting the movement of a viscous fluid between front and rear-side oil chambers divided by the wing portions” are formed between an inner wall of the cylinder and the wing portions and “a selective communication passage having the check valve” is formed between wing portions and one side wall out of two side walls forming the oil chambers so that the side wall and the check valve can be rotated along with the rotation of the wing portions, whereby it is possible to solve such a problem that the check valve is rotated in contact with the inner wall of the cylinder and hence, the check valve is worn by the use thereof for a long period thus prolonging a service life of the damper device.