NOVELTY - An organic photoelectric conversion element (10) comprises 1st electrode (11), 2nd electrode (12), and photoelectric converting layer (3) which is arranged between electrodes and contains compound consisting of benzimidazole derivative as structural unit.    USE - An organic photoelectric conversion element for organic thin-film solar cell (claimed).    ADVANTAGE - The organic photoelectric conversion element using the benzimidazole derivative compound of has a small variance of electric current value and excellent production aptitude.    DETAILED DESCRIPTION - An organic photoelectric conversion element comprises 1st electrode, 2nd electrode, and photoelectric converting layer which is arranged between electrodes and contains compound consisting of benzimidazole derivative compound of formula (A) as structural unit.    X=S, O, Se, Te, and -N(R1x)- or -C(R2x)(R3x)-;    R1x=H, alkyl, alkenyl, alkynyl, aryl, or heteroaryl;    R2x, R3x=alkyl, alkenyl, alkynyl, aryl, or heteroaryl;    R2+R3=ring structure;    Y1=-CCy1, or T;    T=-C(=O)y2, -C(=O)y2, -C(=S)Oy2, -C(=S)SRy2, -C(=O)N(Ry3)(Ry4), -C(=S)N(Ry3)(Ry4), -C(=O)Ry2, -C(=S)Ry2, -CRy5=C(Ry6)(Ry7), -CRy5=NRy8, or -N=NRy9;    Y2=H, F, Cl, alkyl, alkenyl, alkynyl, or T;    Ry1=H, F, alkyl, alkenyl, alkynyl, cycloalkyl, alkoxycarbonyl, acyl, aryl, or heteroaryl;    Ry2-Ry4=H, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, or heteroaryl;    Ry5=H, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, or heteroaryl;    Ry6, Ry7=H, alkyl, alkenyl, alkynyl, cycloalkyl, alkoxycarbonyl, acyl, or CN provided that Ry6 and Ry7 is alkoxycarbonyl, acyl, or CN;    Ry8=H, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, or heteroaryl; and    Ry9=alkyl, alkenyl, alkynyl, cycloalkyl, aryl, or heteroaryl.    INDEPENDENT CLAIMS are included for:    (1) compound containing structural unit of formula (A);    (2) composition containing the compound and organic solvent;    (3) coating film formed by containing the composition;    (4) compound of formula (M1); and    (5) manufacture of compound of formula (M1) which involves going through via compound of formula (M2).    Z1, Z2=halo, perfluoro alkane sulfonyloxy group, trialkyl tin group, trialkylsilyl group, or -B(ORa )2;    Ra=H, alkylsulfonyl, alkyl, or aryl provided that Ra may form rings with one another;    Z3, Z4=F, Cl, Br, or perfluoro alkane sulfonyloxy group; and    Y3=Cl, Br, perfluoro alkane sulfonyl group, or I provided that when Z3 and Z4 are F, Y3 is Cl, Br, perfluoro alkane sulfonyloxy group, or I, when Z3 and Z4 are Cl or perfluoro alkane sulfonyloxy group, Y3 is Br or I, and when Z3 and Z4 are Br, Y3 is I.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional diagram of an organic thin-film solar cell.    Photoelectric converting layer (3)    Transparent support body (7)    Photoelectric conversion element (10)    1st electrode (11)    2nd electrode (12)