A sewing machine needle is attached, fixed or exchanged to a needle clamp firmly and easily. The needle clamp 5 for clamping the sewing machine needle 3 has an accommodating recessed part 7 which accommodates a needle shank 15 of the sewing machine needle, a clamp lever 19 which has a clamp arm 21 which engages to the needle shank, is freely opened and closed and is fixed to a clamp lever abaft 17 which is fitted loosely to an elongate hole 13b which is bored at the needle clamp for the accommodating recessed part and a needle clamp spring 23 which repels elastically the clamp lever to an outer direction of a straight line which links a central point N of the needle shank and a central point of the clamp lever shaft, end the cam 71 is provided in the needle clamp 5, and the cam follower 70 which engages to the cam 71 is provided in the clamp wan 21, and the elongate hole has three surfaces that the can follower climbs over the cam and moves as the movement path of the clamp lever shaft which becomes a rotation center P of the clamp lever.