NOVELTY - A photoelectric conversion element comprises photoreceptor layer which has composite sensitizing dye containing dyes and semiconductor fine particle.    USE - Photoelectric conversion element for photoelectrochemical cell (claimed).    ADVANTAGE - The photoelectric conversion efficiency and durability are high.    DETAILED DESCRIPTION - A photoelectric conversion element comprises photoreceptor layer which has composite sensitizing dye containing dye of formula (1) and dye of formula Mz(LL1)m1(LL2)m2(X)m3.CI (2) and semiconductor fine particle.    X=nonmetallic atom group required to form a nitrogen-containing 5-membered ring, nitrogen-containing 6-membered ring or nitrogen-containing 7-membered ring by bonding with benzene ring (preferably monodentate or bidentate ligand coordinated by acyloxy, acylthio, thioacyloxy, thioacylthio, acylaminoxy, thiocarbamate, dithiocarbamate, thiocarbonate, dithiocarbonate, trithiocarbonate, acyl, thiocyanate, isothiocyanate, cyanate, isocyanate, cyano, alkylthio, arylthio, alkoxy, aryloxy, halogen atom, carbonyl, dialkyl ketone, 1,3-diketone, carbonamide, thiocarbonamide or thiourea);    Y=dye residue;    n= greater than or equal to 1;    Z=substituent;    m=0 or positive integer;    R1=H, aliphatic group, aromatic group or heterocyclic group coupled with C;    Mz=metal atom;    LL1=bidentate ligand of formula (3) or tridentate ligand;    LL2=bidentate ligand or tridentate ligand of formula (4);    m1,m2=0-3 (preferably greater than or equal to 1);    m3=0-2;    CI=counter-ion required to neutralize electric charge;    R101,R102=carboxyl, sulfonic acid, OH, hydroxamic acid, phosphoryl or phosphonyl;    R103,R104=Z;    R105,R106=aryl or heterocyclic group;    d1,d2= greater than or equal to 0;    L1,L2=conjugation chain containing ethenylene and/or ethynylene;    a1,a2,b1,b2=m1;    d3,c=0 or 1; and    Za-Zc=nonmetallic atom group which can form a 5- or 6-membered ring and may have acidic group.    Provided that dye (2) has acidic group(s). That Z, LL1, R101, R102, R103 and R104 may be same or different when m, m1, a1, a2, b1 or b2 is greater than or equal to 2. That LL2 or X may be same or different when m2 or m3 is 2. That R3 or R4 may connect to form a ring. That R103 and R104 may connect to form a ring when both b1 and b2 are greater than or equal to 1.    An INDEPENDENT CLAIM is included for a photoelectric conversion element dye composition comprising dye (1) and dye (2) which are dissolved in organic solvent.