  We propose to use the nuclear spin excitation in the ferromagnetic A1 phase
of the superfluid $^3$He for the axion dark matter detection. This approach is
striking in that it is sensitive to the axion-nucleon coupling, one of the most
important features of the QCD axion introduced to solve the strong CP problem.
We review a quantum mechanical description of the nuclear spin excitation and
apply it to the estimation of the axion-induced spin excitation rate. We also
describe a possible detection method of the spin excitation in detail and show
that the combination of the squeezing of the final state with the Josephson
parametric amplifier and the homodyne measurement can enhance the sensitivity.
It turns out that this approach gives good sensitivity to the axion dark matter
with the mass of $O(1) \, \mu \mathrm{eV}$ depending on the size of the
external magnetic field. We estimate the parameters of experimental setups,
e.g., the detector volume and the amplitude of squeezing, required to reach the
QCD axion parameter space.
