  We present the solutions of the energy spectrum of charge carriers confined
in quantum ring in ABA-stacked trilayer graphene subjected to a perpendicular
magnetic field. The calculations were performed in the context of the continuum
model by solving the Dirac equation for a zero width ring geometry, i.e.
freezing out the carrier radial motion. We show that the obtained energy
spectrum exhibits different symmetries with respect to the magnetic field and
other parameters. The application of a potential shift the energy spectrum
vertically while the application of a magnetic field breaks all symmetries. We
compare our results with those of of the ideal quantum ring in monolayer and
bilayer graphene.
