NOVELTY - A cyclic compound (I) having cyclic structure with unsaturated bond and bis(cyclopentadienylidene)cyclohexadiene structure, is new.    USE - New cyclic compound is used for polymer for organic transistor material for organic-transistor element, and solar-cell material for solar-cell element (all claimed) for motor vehicle and electrical machinery product.    ADVANTAGE - The cyclic compound has reduced lowest unoccupied molecular orbital energy level.    DETAILED DESCRIPTION - A cyclic compound of formula (I) having cyclic structure with unsaturated bond and bis(cyclopentadienylidene)cyclohexadiene structure, is new.    X1-X6=H or monovalent substituent;    or X1-X6+5-membered ring or 6-membered ring=ring structure;    or X1+X2+6-membered ring contained in bis(cyclopentadienylidene)cyclohexadiene structure+2 circular dotted arcs=naphthalene ring;and    or 5-membered ring contained in bis(cyclopentadienylidene)cyclohexadiene structure+4 circular dotted arcs=benzene ring when one or more of X1-X6 is monovalent substituent.    (i) Circular dotted arc in the cyclic compound optionally combines with 5-membered ring or 6-membered ring contained in bis(cyclopentadienylidene)cyclohexadiene of cyclic compound to form ring structure; (ii) When circular arc forms ring structure, ring structures are bonded; (iii) When circular arc does not form ring structure, a portion of 5-membered ring or 6-membered ring contained in bis(cyclopentadienylidene)cyclohexadiene is attached to carbon atom which becomes a portion of ring structure when ring structure is formed; and (iv) When X1-X6 contains chlorine atom, one or more of X1-X6 is H or monovalent substituent other than chlorine atom. INDEPENDENT CLAIMS are included for the following:    (1) polymer, which has cyclic structure with unsaturated bond, and is obtained by polymerizing monomer component containing cyclic compound of formula (II) having bis(cyclopentadienylidene)cyclohexadiene structure and reactive group; and    (2) manufacture of cyclic compound.    X7-X10=X1, where at least one of X7-X10 is substituent having reactive group.