Fumio Hiroshima Self-adjointness of the Pauli-Fierz Hamiltonian for arbitrary coupling constants (151K, dvi) ABSTRACT. The Pauli-Fierz Hamiltonian describes a system of $N$ electrons interacting with a quantized radiation field. The electrons have spin and an ultraviolet cutoff is imposed on the quantized radiation field. For {\it arbitrary} coupling constants, self-adjointness and essential self-adjointness of the Pauli-Fierz Hamiltonian are proven under a class of ultraviolet cutoffs.