  In this paper, we define a set of good basic invariants for the elliptic Weyl
group for the elliptic root system. For an elliptic root system of codimension
$1$, we show that a set of good basic invariants gives a set of flat invariants
obtained by Saito and Taylor coefficients of the good basic invariants give the
structure constants of the multiplication of the Frobenius structure obtained
by the author.
