NOVELTY - An organic thin-film transistor comprises an naphtho bisbenzo furan compound (I) in a semiconductor active layer (14).    USE - Organic thin film transistor is used as organic field effect transistor. Uses include but are not limited to organic photoelectric conversion element, solid-state image sensor of optical sensor, solar cell, gas sensor, organic rectifier, organic inverter and information recording element.    ADVANTAGE - The organic thin film transistor has excellent carrier mobility, reduced variation of threshold voltage even after repeated driving. Crystallization of naphtho bisbenzo furan compound contained in the organic thin film transistor does not occur easily.    DETAILED DESCRIPTION - An organic thin-film transistor comprises an naphtho bisbenzo furan compound of formula (I) in a semiconductor active layer.    R1-R12,R'=H or substituent;    at least one of R1-R12=substituent of formula (i) or all of R1-R12 is H;    L=single bond, or divalent linking group of formula (ii)-(xiii);    R=optionally substituted 2C or more alkyl, oligoethyleneoxy group having two or more repeating ethyleneoxy units or oligosiloxane group having two or more silicon atoms;    wavy bond=bonding position with naphtho bisbenzo furan skeleton;    asterisk=bonding position with R;    n=1 or more;    m=4;and    m'=2.    INDEPENDENT CLAIMS are included for the following:    (1) naphtho bisbenzo furan compound (I);    (2) organic semiconductor material, which comprises the naphtho bisbenzo furan compound (I);    (3) organic thin film transistor material, which comprises the naphtho bisbenzo furan compound (I);    (4) coating solution, which comprises the naphtho bisbenzo furan compound (I); and    (5) organic semiconductor thin film, which comprises the naphtho bisbenzo furan compound (I).    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of organic thin film transistor.    Substrate (11)    Electrodes (12,15a,15b)    Insulator layer (13)    Semiconductor active layer (14)