NOVELTY - An organic photoelectric conversion element (10) has a power generating layer (103) containing a p-type semiconductor material (103a) and a n-type semiconductor material (103b) and a charge transport layer (102,104) that mainly transports holes or electrons, provided between a pair of electrodes (101,105). The charge transport layer contains a polymer (A) that has at least one unit selected from three alkylene group-containing units (I), (II) and (III).    USE - Organic photoelectric conversion element e.g. bulk heterojunction type organic photoelectric conversion element (organic solar cell).    ADVANTAGE - The organic photoelectric conversion element has improved short-circuit current density by reducing optical loss of charge transport layer, and excellent fill factor by suppressing leakage and reducing damage to the charge transport layer during formation of counter electrode. The organic photoelectric conversion element is excellent in durability even at high temperature and high humidity conditions.    DETAILED DESCRIPTION - An organic photoelectric conversion element has a power generating layer containing a p-type semiconductor material and an n-type semiconductor material and a charge transport layer that mainly transports holes or electrons, provided between a pair of electrodes. The charge transport layer contains a polymer (A) that has at least one unit selected from three alkylene group-containing units of formulae: -(CH2-CX(-OR1OH))l- (I), -(CH2-CX(-COOR2OH))m- (II) and -(CH2-CX(-CONHR3OH))n- (III).    X=H or methyl;    R1-R3=1-5C linear or branched alkylene;    l,m,n=number-of-moles of monomer in the polymer;and    l+m+n=50-100 mol%.    An INDEPENDENT CLAIM is included for manufacture of organic photoelectric conversion element, which involves performing heat-treatment process after forming charge transport layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of organic photoelectric conversion element.    Organic photoelectric conversion element (10)    Electrodes (101,105)    Charge transport layers (102,104)    Power generating layer (103)    P-type semiconductor material (103a)    N-type semiconductor material (103b)