To provide an electromagnetic needle selector that can raise the certainty of operation and reduce the cost for adjusting a knitting machine by warping a virtual plane that includes a contact pole face of a needle selecting part and/or magnetic pole face of a magnetic member for needle selection when viewed in the longitudinal direction of the needle selecting part.

This electromagnetic needle selector comprises a virtual plane 270a that includes a contact pole face 12b of a needle selector part 4 and/or magnetic pole faces 23, 24, 25, 26 of a magnetic member for the needle selector and/or a support member 27 for a contact pole face, and which is, at least partially, warped when viewed in the longitudinal direction of the needle selecting part 4, thus extremely reducing variations of an effective clearance between the needle selecting part and the magnetic pole face.