Semiconductor 2-dimensional position detector 1 for detecting the position of the radiation in two dimensions, and the semiconductor substrate (2), juxtaposed with a predetermined interval in the X direction on the surface (2A) of the semiconductor substrate (2), first to n parallel to the Y-direction (n is an integer of 2 or more) and the stripe electrode (3), the Schottky diode and a back surface electrode formed on the (2B) (15) of the semiconductor substrate (2) becomes, with sequentially connected to both end portions via the resistor (4, 5) of each stripe electrode (3), from the opposite ends of the stripe electrodes of the first and second n arranged at both ends (3), a semiconductor taking out a signal output signal