NOVELTY - An anthraquinone derivative having aromatic group-containing structural units (Z) chosen from (i)-(xxv), and unsaturated-group containing structural unit (I), is new.    USE - New anthraquinone derivative for p-type organic semiconductor material for photoelectric conversion material for photoelectric converting layer for photoelectric conversion element (all claimed) for photodiode, photo detector and organic thin-film solar cell.    ADVANTAGE - The anthraquinone derivative has excellent solubility and coatability, and is economical. The organic semiconductor material formed using the anthraquinone derivative has high carrier mobility, and excellent characteristics. The coating process of semiconductor element is carried out easily. The photoelectric conversion element has high photoelectric conversion efficiency.    DETAILED DESCRIPTION - An anthraquinone derivative having aromatic group-containing structural unit (Z) chosen from group of formula (i)-(xxv), and unsaturated-group containing structural unit of formula (I), is new.    X 1,X 2=O, or S;    R 4-R 8=hydrocarbyl (optionally substituted);    X 3=S, or NR 6;    X 4=S, NR 6, CR 7R 8, or SiR 7R 8;    X 5=S, O, or NR 6;and    k=1-4.    Hydrogen atom in structural units (I) and (i)-(xxv) is optionally substituted by fluorine, chlorine, bromine, iodine, cyano, nitro, hydroxyl, thiol, -NR 4R 5, optionally substituted hydrocarbon, or optionally substituted heterocyclic group, where R 4 and R 5 is optionally substituted hydrocarbon group. INDEPENDENT CLAIMS are included for the following:    (1) p-type organic semiconductor material, which is formed using anthraquinone derivative;    (2) photoelectric conversion material, which consists of p-type organic semiconductor material and n-type organic semiconductor material;    (3) photoelectric converting layer, which is obtained by forming photoelectric conversion material into a film; and    (4) photoelectric conversion element, which has photoelectric converting layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of photoelectric conversion element.    Support (1)    Electrodes (2,5)    Charge transferring layer (3)    Photoelectric converting layers (4,6)