A supporting mechanism for a supporting device that supports supporting arms to which a pressing down load is applied on one side relative to an attaching element such that the former are mobile at least in a horizontal direction, as well as a supporting device having a supporting mechanism is disclosed. The solution is sought by using a swivel torque hinge having a friction torque generating mechanism using elastic members such as friction washers and spring washers for the supporting mechanism by pivotally supporting a shaft upper portion of a hinge shaft of the swivel torque hinge on an attaching hole portion provided on the supporting arms by providing a bracket supporting the supporting arms on the hinge shaft via the friction torque generating mechanism.