In this study, bipolar charge carrier transport of 2,7,12-trioctyloxytruxene has been studied by a time-of-flight method. The substance studied exhibits a hexagonal columnar mesophase of which melting and clearing points are 118 degrees C and 133 degrees C, respectively. Ambipolar electronic carrier transports were observed in the mesophase. The drift mobility measurements reveal it is in the order of 10(-2) cm(2) V(-1) s(-1) in the Col(h) and it increases to 10(-1) cm 2 V(-1) s(-1) at the columnar mesophase - metastable phase transition, indicating truxene is an interesting molecular core for mesophase semiconductors.