The methaniminium ion (H2C=NH2+) was produced in a pulsed electrical discharge supersonic expansion of argon saturated with ethylenediamine vapor. It was identified and mass selected in a time-of-flight spectrometer. Its infrared spectrum was measured in the region of 2100-4100 cm(-1) by photodissociation of the argon-tagged complex with a tunable infrared OPO/OPA laser system. The observed infrared spectrum was not described well by scaled harmonic theory, but could be assigned by comparison to second order vibrational perturbation theory computations at the B2PLYP/def2-QZVPP level.