NOVELTY - An azulene ring-containing compound (I), is new.    USE - New azulene ring-containing compound is used for forming organic photoelectric conversion film for photoelectric-conversion element for image pick-up element, optical sensor (all claimed) and solar cell.    ADVANTAGE - The azulene ring-containing compound is prepared by simple process, and has weight average molecular weight of 3000-500000. The photoelectric-conversion element containing the layer formed using the compound has suppressed reduction in photoelectric-conversion efficiency, low dark current property and residual image characteristics by heating.    DETAILED DESCRIPTION - An azulene ring-containing compound of formula (I), is new.    A=bivalent group of formula (a);    S1,S2=arylenyl, heteroarylenyl, alkenylenyl, alkynylenyl or -CRs=N-;    Rs=H or monovalent substituent;    B'=bivalent group chosen from 22 groups of formulae (b)-(w);    a=1-4;    b-d=0-4;    Xa11,Xb61,Xb71,Xb91,Xb111,Xb131,Xb171,Xb191,Xb201,Xb201,Xb211=sulfur atom, oxygen atom, selenium atom, or -NRa11-;    Ra11=H, alkyl, alkenyl or alkynyl;    Xa12,Xb21,Xb31,Xb41,Xb51,Xb62,Xb102,Xb122,Xb133,Xb141,Xb151,Xb162,Xb182,Xb202=oxygen atom or sulfur atom;    Ya11=-CRa12 or nitrogen atom;    Ra12=H or monovalent substituent;    Ya12=-NRa13-, -C(Ra13)2- or -C(=C(Ra14)2)-;    Ra13=H, alkyl, alkenyl, or alkynyl, where two Ra13 combines to form ring;    Ra14=H, alkyl, alkenyl or alkynyl, where two Ra14 combines to form ring;    Xb11,Xb81=sulfur atom, oxygen atom, selenium atom, -NRb51- or -C(Rb51)2-;    Rb51=H, alkyl, alkenyl, or alkynyl;    or Rb51+2 or more -C(Rb51)2-=ring;    Yb22,Yb11,Yb32,Yb42,Yb52,Yb72=-CRb52,Yb81,Yb91,Yb121,Yb131,Yb151,Yb161,Yb172,Yb173,Yb181,Yb191,Yb202, Yb211,Yb213=-CRb52 or nitrogen atom;    Rb52=H or monovalent substituent;    Yb21,Yb31,Yb41,Yb51,Yb61,Yb201=-NRb21-, -C(Rb21)2-, -C(=C(Rb21)2)-, oxygen atom, or sulfur atom;    Rb21=H, alkyl, alkenyl, alkynyl, aryl, or heteroaryl;    or Rb2+1+two or more -C(Rb21)2- or - C(=C(Rb21)2)-=ring;    Yb71,Yb92,Yb171=-CRb71,Yb171,Yb212=-CRb72 or nitrogen atom;    Rb71=H or monovalent substituent;    Xb101,Xb121,Xb132,Xb142,Xb152,Xb161,Xb181=-NRb101-, oxygen atom or sulfur atom;and    Rb101=H, alkyl, alkenyl, alkynyl, aryl, or heteroaryl.    When b in formula (I) is 0, at least one of two Ya11 is nitrogen atom. INDEPENDENT CLAIMS are included for the following:    (1) photoelectric-conversion element (10a), which comprises an electroconductive film (11), an organic photoelectric-conversion film (12) containing compound having azulene ring-containing repeating unit of formula (I), and a transparent conductive film (15) in order;    (2) usage method of photoelectric-conversion element, which involves forming an electroconductive film and a transparent conductive film between a pair of electrodes; and    (3) manufacture of azulene ring-containing compound.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic cross-sectional view of photoelectric-conversion element.    Photoelectric-conversion element (10a)    Electroconductive film (11)    Organic photoelectric-conversion film (12)    Upper electrode (15)    Electron-blocking layer (16A)