  We construct $\theta$-deformations of the classical groups SL(2,H) and Sp(2).
Coacting on the basic instanton on a noncommutative four-sphere $S^4_\theta$,
we construct a noncommutative family of instantons of charge 1. The family is
parametrized by the quantum quotient of $SL_\theta(2,H)$ by $Sp_\theta(2)$.
