When joining end faces of a plurality of soft magnetic plates overlapping in the plate thickness direction and bent at a portion to be a corner portion of an iron core, the position of the end faces is suppressed from shifting from a desired position. Among the regions of the window portion, which is an inner region of the first portion 110 and the second portion 120, in the longitudinal direction, so as to contact the region of the inner circumferential surface between the first corner portion 101 and the third corner portion 103 ( The third portion 130 having the same length in the X-axis direction at the position in which the window portion is disposed is disposed (in the X-axis direction).
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