The in-cyanobenzyl radical was generated for the first time in a jet from m-tolunitrile seeded in a large amount of inert helium carrier gas and vibronically excited using a pinhole-type glass nozzle in a corona excited supersonic expansion. The vibronically well-resolved emission spectrum of the jet-cooled in-cyanobenzyl radical in the D-1 --> D-0 transition was recorded with a long-path monochromator in the visible region. The observed spectrum was analyzed to determine accurate electronic transition and vibrational mode frequencies in the ground electronic state by comparison with those from an ab initio calculation, as well as with those of m-tolunitrile.