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In this work we present the theory of balance equations of Continuum Thermodynamics (balance systems) in a geometrical form using the Poincare-Cartan formalism of Multisymplectic Field Theory. A constitutive relation C of a balance system BC is realized as a mapping between a (partial) 1-jet bundle of the configurational bundle π : Y → X and the dual bundle similar to the Legendre mapping of the Lagrangian Field Theory. Invariant (variational) form of the balance system BC is presented in three different forms and the space of admissible variations is defined and studied. Action of automorphisms of the bundle π on the constitutive mappings C is studied and it is shown that the symmetry group Sym(C) of the constitutive relation C acts on the space of solutions of balance system BC. A version of the Noether Theorem for an action of a symmetry group of vertical automorphisms is presented with the usage of conventional multimomentum mapping. The "entropy principle" of Irreducible Thermodynamics (the requirement that the entropy balance should be the consequence of the balance system) is studied for general balance systems. The structure of corresponding (secondary) balance laws of a balance system BC is studied for the cases of different (partial) 1-jet bundles as domains of constitutive laws. Corresponding results may be considered as a generalization of the transition to the dual, Lagrange-Liu picture of Rational Extended Thermodynamics (RET).