Provided is a hinge device which allows the display device to be watched at an arbitrary angle, thus enabling all the passengers to watch the display at an optimum angle, which helps to achieve an improvement in terms of quality and reliable dropping (opening) by causing the dropping (opening) movement of the display device due to its own weight to be reliable and gentle in the range from the start to an angle of approximately 30°, and which helps to achieve an improvement in terms of operational feel in the free stop range, thus allowing light operation. The hinge device for connecting one member and another member so that the one member and the other member can open and close includes: a bracket which is fixed to one member; a shaft which is rotatably attached to the bracket and which is fixed to another member; a braking member which is attached to the shaft so that the braking member is non-rotatable but axially movable and which is held in sliding contact with the bracket and adapted to make mutual relative rotation; and a plate spring member which is attached to the shaft so that the plate spring member is non-rotatable but axially movable and which holds the braking member in press contact with the bracket. A surface of the bracket held in sliding contact with the braking member is provided with a recessed groove one end portion of which is formed as a tapered portion, with the surface of the braking member held in sliding contact with the bracket being provided with a protrusion coming into sliding contact with a sliding contact surface, a recessed groove, and a tapered portion of the bracket, the protrusion having a flat top portion at least one end of which is formed as a tapered portion continuous with the flat top portion.