  We study Rarita-Schwinger fields on 6-dimensional compact strict nearly
K\"{a}hler manifolds. In order to investigate them, we clarify the relationship
between some differential operators for the Hermitian connection and the
Levi-Civita connection. As a result, we show that the space of the
Rarita-Schwinger fields coincides with the space of the harmonic 3-forms.
Applying the same technique to a deformation theory, we also find that the
space of the infinitesimal deformations of Killing spinors coincides with the
direct sum of a certain eigenspace of the Laplace operator and the space of the
Killing spinors.
