NOVELTY - A photoelectric conversion element contains metal complex pigment (I) and semiconductor fine particles obtained using cationic surfactant (II).    USE - Photoelectric conversion element is used for photoelectrochemical cell (claimed) e.g. solar cell.    ADVANTAGE - The photoelectric conversion element has high photoelectric conversion efficiency, performance ability with respect to visible light and durability.    DETAILED DESCRIPTION - A photoelectric conversion element contains metal complex pigment of formula: ML1L2(A1)n0(CI1)n1 (I) and semiconductor fine particles obtained using cationic surfactant of formula: R44-N+(-R43)(-R45)-R46Cl2 (II).    M=metallic element;    A1=ligand;    CI1=counteranion;    n0=0-2;    n1=0-4;    L1=group of formula (i);    L2=group of formula (ii);    or L1+L2+N=pyridine ring or quaterpyridine ligand;    R1,R2,R5=alkyl, alkoxy, -O-R64, -COO-R65, -CO-N(-R40)(-R66), -COON(-R41)-R67, or groups chosen from group of formulae (iii)-(xiii);    S1-S3=ethenylene, ethynylene or arylene;    l1-l3=0-5;    n2,n7=0-3;    n3=0-2;    A11-A13=acidic group or its salt;    n4-n6=0-3;    n8=0 or 1;    R7-R41,R51-R55,R61-R63,R68,R69=H, alkyl, alkenyl, alkynyl, alkoxy, thioalkyl, aryl, aryloxy, arylthio, amino, heterocyclyl or halo;    or R69+R7+adjacent R9-R12+R14+R15,R17+R18+adjacent R20-R23,R25+R26+adjacent R28-R31,R32+R33,adjacent R34-R39,R52+R55=ring;    or R24+R27=ring;    m1-m11=1-5;    R64-R67=H, alkyl, alkenyl, alkynyl, aryl, heteroaryl or halo;    Y1-Y3,X=S, O, Se, Te or NR42;    R42=H, alkyl, alkenyl, aryl, alkynyl or heterocyclyl;    at least one of R47,R48=acidic group or its salt, and remainder of R47 and R48 is H or alkyl;and    R43-R46=H, alkyl, alkenyl, alkynyl or alkoxy.    (i) When n2 is 1 or more, then R3 optionally forms ring by bonding with S1; (ii) when n3 is 1 or more, then R4 optionally forms ring by bonding with S2; (iii) when n2 is 2 or more, then adjacent R3 optionally coupled to form ring; (iv) when n7 is 1 or more, then R6 optionally forms ring by bonding with S3; (v) when n3 is 2 or more, then adjacent R4 optionally coupled to form ring; (vi) when n7 is 2 or more, then adjacent R6 optionally coupled to form ring; (vii) when n2, n3 and n7 are 1 or more, then R3, R4 and R6 are optionally coupled to form ring. INDEPENDENT CLAIMS are included for the following:    (1) photoelectrochemical cell, which contains photoelectric conversion element; and    (2) titanium oxide particles, which has specific surface area of 50-400 m2/g, roughness coefficient of 1000-1500 and average particle diameter of 1-20 nm.