A slider needle having a partition element clipped through an insertion slit in the needle base body. The partition element is shaped such that it can be easily inserted in the needle base body, but is still securely held, optionally with some play, as a result of positive engagement. The partition element comprises, preferably as a one-piece component, a spring part and a foot extension interacting with the bottom of the slider slit. Preferably, the foot extension has two sections that are bent in opposite directions, either in a transverse or a longitudinal direction of the otherwise flat partition element. In the region of the insertion slit, the back of the needle base body has an indentation so that the bent over sections cannot project beyond the needle back. Preferably, the spring part is formed into one piece with the partition element. Thereby the invention eliminates the loss of the spring part and can perform a cost-efficient manufacturing.