A hinge device for a door of a refrigerator, etc. moves the center of rotation of the door by interlocking with the opening/closing operations of the door, while stabilizing the opening/closing operations without any hindrance such as rattling. The hinge device comprises: a shaft member which is mounted on a refrigerator main body and comprises a hinge pin; a bearing member which is mounted on a door and comprises a long hole which is in contact with the hinge pin to be relatively movable or relatively rotatable with respect to the hinge pin; and a cam which is installed on the hinge pin and constitutes a cam unit by contacting a cam follower of the bearing member.