Abstract: A clamp device for clamping inner leads of a lead frame includes a clamp fixing plate having a working opening and a plurality of inner lead clamps each made of a plate spring and fixedly mounted to an upper surface of the clamp fixing plate. Each of the inner lead clamps has at an inner end thereof a vertical pressing portion normal to the clamp fixing plate upper surface and extending downward into the working opening of the clamp fixing plate and is adapted to press a group of inner leads. The pressing portion of each inner lead clamp may have a plurality of uniformly spaced cut-out portions so that inner leads are clamped individually. A plurality of spaced bolt holes may be formed around the peripheral edges of the working opening. In this case, a compression coil spring is fitted around a bolt received in each bolt hole between the clamp fixing plate and each corresponding inner lead clamp.