Fluorescence-excitation, hole-burning, and dispersed-fluorescence spectra of 2,2’-bithiophene in a supersonic jet were measured. Two species were identified in the fluorescence-excitation spectra and were distinguished clearly in the hole-buring spectra. These species have the origin bands with the 91.4 cm(-1) shift to each other and show almost the same vibronic structures. They are assigned to the vibronic bands due to 2,2’-bithiophenes in the ground and low-lying excited vibrational states. Long and harmonic progressions due to the torsional vibration in the excited electronic state suggest a substantial change in the torsional angle upon the electronic excitation. The equilibrium structure of 2,2’-bithiophene in the excited electronic state is found to be trans planar with a deep, harmonic, and single-minimum torsional potential around the equilibrium structure. In the dispersed-fluorescence spectra, short and anharmonic progressions due to the torsional vibration-in the ground electronic state were observed. By simulating the progressions, 2,2’-bithiophene in the ground electronic state is found to have a double-minimum torsional potential, whose equilibrium structures are twisted by about 21 degrees from the trans-planar structure. The height of the barrier between the minima is estimated to be about 25 cm(-1). Franck-Condon calculations were also performed to examine the observed intensity distributions in the fluorescence-excitation, hole-burning, and dispersed-fluorescence spectra.