  The no-hair theorem by Mayo and Bekenstein states that there exists no
non-extremal static and spherical charged black hole endowed with hair in the
form of a charged scalar field with a self-interaction potential. In our recent
work, we showed that the effect of a scalar mass term is important at an
asymptotic infinity, which was omitted to prove the no-hair theorem. In this
paper, we demonstrate that there actually exists static and spherical charged
scalar hair, dubbed as Q-hair, around charged black holes, by taking into
account the backreaction to the metric and gauge field. We also discuss that
Q-cloud, which is constructed without the backreaction around a
Reissner-Nordstr\"{o}m black hole, is a good approximation to Q-hair under a
certain limit.
