  We show a connection formula between two different $q$-Airy functions. One is
called the Ramanujan function which appears in Ramanujan's "Lost notebook".
Another one is called the $q$-Airy function that obtained in the study of the
second $q$-Painlev\'e equation. We use the $q$-Borel transformation and the
$q$-Laplace transformation following C. Zhang to obtain the connection formula.
