Rovibrational levels with one quantum of CH stretch mode, (1, v₂, v₃), in the ¹A” electronic state of HCP were observed for the first time by IR-UV double resonance spectroscopy. Nine vibrational levels were identified in the energy region of 37 500-40 800 cm^-1. Perturbations similar to those in the (0, v₂, v₃) levels were also observed in many of the vibrational levels. It was found that the CH stretch frequency in the A ¹A” state is reduced about 270 cm^-1 relative to that of the electronic ground state.