  It is shown that the Lagrangian density of the supersymmetric 3-brane can be
regarded as a component of an infinite-dimensional supermultiplet of N=2, D=4
supersymmetry spontaneously broken down to N=1. The latter is described by N=1
Hermitian bosonic matrix superfield V_{mn} = V^\dagger_{nm}, [V_{mn}] = m+n,
m,n=0,1,... in which the component V_{01} is identified with a chiral Goldstone
N=1 multiplet associated with central charge of the N=2, D=4 superalgebra, and
V_{11} obeys a specific nonlinear recursive equation providing the possibility
to express V_{11} (as well as the other components V_{mn}) covariantly in terms
of V_{01}. We demonstrate that the solution of V_{11} gives the right
\emph{PBGS} action for the super-3-brane.
