To provide a hinge mechanism appropriate for a flip-up counter to be installed in a convenience store, a dining kitchen for business use and a snack bar, and capable of being attached to a relatively large-sized type.

A hinge mechanism includes a first hinge part that is attached to a movable body, a second hinge part that is attached to a fixed body and that assumes a shape symmetrical to that of the first hinge part, and a link bracket that is swingably connected to each of the first and second hinge parts. Parallel pivots pass through barrels of the hinge parts and a sleeve through-hole of the bracket to achieve whole integration, respectively.