NOVELTY - A photoelectric conversion element (10) has photoreceptor layer (2) containing composite sensitizing dye (21), and semiconductor fine particles (22). The composite sensitizing dye is nitrogen-containing dye (I) and/or bidentate or tridentate ligand-containing dye (II) having acidic absorbing group.    USE - Photoelectric conversion element is used for photoelectrochemical cell (claimed), photosensor, copier and solar cell.    ADVANTAGE - The element has excellent photoelectric conversion efficiency and durability.    DETAILED DESCRIPTION - A photoelectric conversion element has photoreceptor layer containing composite sensitizing dye, and semiconductor fine particles. The composite sensitizing dye is nitrogen-containing dye of formula (I) and/or bidentate or tridentate ligand-containing dye of formula: M(LL1)r(LL2)s(X) tCI (II) having acidic absorbing group.    A=5-7 membered nitrogen-containing heterocyclic ring;    L11=electron-transport property coupling group including heterocyclic ring chosen from thiophene ring, furan ring, pyrrole ring, selenophene ring, and cyclocondensed heterocyclic ring;    R11, R13=H, alkyl, alkoxy, and aryl;    R12=H or substituent;    B1=methylene substituted by heterocyclic acidic nucleus or electron withdrawing group, and has at least one acidic group;    n=1-12;    M=metal;    LL1=bidentate ligand of formula (i) or tridentate ligand;    R21, R22=carboxy, sulfonic acid, hydroxy, hydroxamic acid, phosphoryl, or phosphonyl;    R23, R24=substituent, or    R23+R24=ring (when both c and d are 1 or more);    R25, R26=alkyl, aryl, and/or heterocyclic group;    L21, L22=conjugated chain containing ethenylene, and/or ethynylene;    a-d=0-3;    m,p=0-5;    q=0 or 1;    LL2=optionally substituted bidentate ligand of (ii), or tridentate ligand;    P',Q',R'=nonmetallic atom which forms 5 or 6 membered ring;    l=0 or 1;    X=monodentate or bidentate ligand coordinated by group chosen from acyloxy, acylthio, thio acyloxy, thio acylthio, acylamino oxy, thiocarbamate, dithiocarbamate, thio carbonate, dithio carbonate, trithio carbonate, acyl, thiocyanate, isothiocyanate, cyanate, isocyanate, cyano, alkylthio, arylthio, alkoxy, and aryloxy, or monodentate or bidentate ligand containing halo, carbonyl, dialkyl ketone, 1,3-diketone, carbonamide, thio carbonamide, or thiourea;    r=1-3;    s=0-2;    t=0-3;    Za-Zc=non-metal atom group forming a 5- or 6-membered ring;    c=0 or 1, and    CI=counter-ion which neutralizes electric charge.    An INDEPENDENT CLAIM is included for photoelectric conversion element dye composition, which contains dye (I) and (II).    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of photoelectric conversion element.    Electroconductive support (1)    Photoreceptor layer (2)    Charge-transfer component (3)    Counter electrode (4)    Light reception electrode (5)    Circuit (6)    Photoelectric conversion element (10)    Dye (21)    Semiconductor fine-particles (22)    Photoelectrochemical cell (100)