  We report on realization and quantum transport study of a twisted bilayer
graphene (tBLG) Josephson junction device. High-quality tBLG employed in the
device fabrication is obtained via chemical vapour deposition and the device is
fabricated by contacting a piece of tBLG by two closely spaced Al electrodes in
an Al-tBLG-Al Josephson junction configuration. Low-temperature transport
measurements show that below the critical temperature of the Al electrodes
($T_c\approx1.1$ K), the device exhibits sizable supercurrents at zero magnetic
field, arising from the superconducting proximity effect with high contact
transparency in the device. In the measurements of the critical supercurrent as
a function of perpendicularly applied magnetic field, a standard
Fraunhofer-like pattern of oscillations is observed, indicating a uniform
supercurrent distribution inside the junction. Multiple Andreev reflection
characteristics are also observed in the spectroscopy measurements of the
device, and their magnetic field and temperature dependencies are found to be
well described by the Bardeen$-$Cooper$-$Schrieffer theory.
