NOVELTY - The element i.e. organic thin film transistor (TFT) (100), has an organic semiconductor layer (40), and an upper surface layer (50) made of metal i.e. gold, formed on an upper surface of the semiconductor layer. An outline (51) of the upper surface layer is formed inside an outline (41) of the semiconductor layer. A wiring layer is formed on the upper surface, where a side surface of the semiconductor layer is provided with a contact layer, which is the upper surface layer made of metal oxide or electrically conductive polymer to provide ohmic contact with the semiconductor layer.    USE - Semiconductor element i.e. organic semiconductor element such as top-contact staggered-type organic TFT, for use in an active matrix circuit of a display device i.e. electrophoretic display such as electronic paper display, in an electronic apparatus (claimed) such as electronic book, TV, digital camera, notebook-size personal computer, video camera and cellular phone. Can also be used for display device such as organic electro luminescence (EL) display, and electronic apparatus such as flexible printed circuit board, organic thin film solar cell and touch panel.    ADVANTAGE - The outline of the metal layer on the upper surface of the organic semiconductor layer is formed inside the outline of the organic semiconductor layer, so that an end portion of the metal layer on the upper surface extends off the organic semiconductor layer to prevent defects in the shape of the metal layer such as eaves portion, thus avoiding the occurrence of break in the wiring layer formed on the organic semiconductor caused by the wiring layer cutting at the eaves portion. The element comprises a source electrode and a drain electrode that are made of a material different from the material of the upper surface layer, so that the material cost can be reduced and better ohmic contact is ensured by the upper surface layer formed of gold. The upper surface layer is formed of the electrically conductive polymer, so that oxidation of electrode surface does not occur at an interface at which the semiconductor and the electrode come into contact with each other, and the contact characteristics can be stabilized.    DESCRIPTION OF DRAWING(S) - The drawing shows a top view of an organic TFT.    Organic semiconductor layer (40)    Outline of semiconductor layer (41)    Upper surface layer (50)    Outline of upper surface layer (51)    Semiconductor element (100)