NOVELTY - A solid junction-type photoelectric conversion element (1) comprises a photoelectric converting layer (3) provided between a pair of transparent electrode substrate (2) consisting of a transparent substrate (21) and a transparent electrode layer (22) formed on the transparent substrate, and a layer (4) including a porous semiconductor fine particle layer (41) and a film or adsorbent containing organic-inorganic mixed perovskite compound (A) (42) and a layer (5) containing inorganic perovskite compound (B) and/or organic-inorganic mixed perovskite compound (C) (I) or (II).    USE - Solid junction-type photoelectric conversion element (claimed).    ADVANTAGE - The solid junction-type photoelectric conversion element has excellent photoelectric conversion efficiency, durability, light resistance and moisture resistance, and can be manufactured by simple process.    DETAILED DESCRIPTION - A solid junction-type photoelectric conversion element comprises a photoelectric converting layer provided between a pair of transparent electrode substrate consisting of a transparent substrate and a transparent electrode layer formed on the transparent substrate, and semiconductor layers (4,5) provided on the photoelectric converting layer. The semiconductor layer (4) includes a porous semiconductor fine particle layer and a film or adsorbent containing organic-inorganic mixed perovskite compound (A) of formula: R1(M1X3)n. The semiconductor layer (5) contains inorganic perovskite compound (B) of formula: CsM2X3 and/or organic-inorganic mixed perovskite compound (C) of formula: CH3NH3SnX3 (I) or (R2NH3)2SnX4 (II).    n=positive integer;    R1=amine polymer of formula (Ia), (Ib) or (Ic);    M1=bivalent metal ion;    X=F, Cl, Br, or I;    x=0 or 1, or 0, or 1-4;    R=H, 1C or more alkyl, alkenyl, aralkyl, aryl, heterocyclyl, or aryl;    M2=bivalent metal ion;and    R2=2C or more alkyl, alkenyl, aralkyl, aryl, heterocyclyl, or aryl.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the structure of the solid junction-type photoelectric conversion element.    Photoelectric conversion element (1)    Transparent electrode substrate (2)    Photoelectric converting layer (3)    Semiconductor layers (4,5)    Buffer layer (6)    Transparent substrate (21)    Transparent conductive layer (22)    Porous semiconductor fine particle layer (41)    Organic-inorganic mixed perovskite compound (42)