  We present the entanglement measures of a tetrapartite W-Class entangled
system in noninertial frame, where the transformation between Minkowski and
Rindler coordinates is applied. Two cases are considered. First, when one qubit
has uniform acceleration whilst the other three remain stationary. Second, when
two qubits have nonuniform accelerations and the others stay inertial. The
$1-1$ tangle, $1-3$ tangle and whole entanglement measurements ($\pi_4$ and
$\Pi_4$), are studied and illustrated with graphics through their dependency on
the acceleration parameter $r_d$ for the first case and $r_c$ and $r_d$ for the
second case. It is found that the Negativities ($1-1$ tangle and $1-3$ tangle)
and $\pi$-tangle decrease when the acceleration parameter $r_{d}$ or in the
second case $r_c$ and $r_d$ increase, remaining a nonzero entanglement in the
majority of the results. This means that the system will be always entangled
except for special cases. It is shown that only the $1-1$ tangle for the first
case, vanishes at infinite accelerations, but for the second case the $1-1$
tangle disappears completely when $r>0.472473$. It is found an analytical
expression for von Neumann information entropy of the system and we notice that
it increases with the acceleration parameter.
