The probe assembly according to the present invention comprises a probe board and a plurality of probes. Each probe has an arm portion extending from the probe board at a distance and substantially along the probe board, a tip portion provided in the arm portion and projecting in a direction away from the probe board, and the tips provided in the tip portions are supported on the probe board at their base ends so as to be arranged in a matrix state on an imaginary XY plane along the X-axis and Y-axis. The respective probes are arranged so that the extending directions of said arms are arranged angularly relative to the X-axis and Y-axis and parallel to one another as seen on a plane P parallel to the imaginary plane.