  In this paper, we discuss dark matter candidates in a visible heavy QCD axion
model. There, a mirror copied sector of the Standard Model with mass scales
larger than the Standard Model is introduced. By larger mass scales of the
mirrored sector, the QCD axion is made heavy via the axial anomaly in the
mirrored sector without spoiling the Peccei-Quinn mechanism to solve the strong
$CP$-problem. Since the mirror copied sector possesses the same symmetry
structure with the Standard Model sector, the model predicts multiple stable
particles. As we will show, the mirrored charged pion and the mirrored electron
can be viable candidates for dark matter. They serve as self-interacting dark
matter with a long range force. We also show that the mirrored neutron can be
lighter than the mirrored proton in a certain parameter region. There, the
mirrored neutron can also be a viable dark matter candidate when its mass is
around $100$ TeV. It is also shown that the mirrored neutrino can also be a
viable candidate for dark matter.
