There is provided a flat knitting machine in which the knitting yarn is less likely to be nipped between a fixed sinker and a movable sinker. The flat knitting machine includes a fixed sinker 4 and a movable sinker 5. Assuming a direction from an inoperative position, where the movable sinker does not make contact with a sinker loop, to an operative position, where the movable sinker makes contact with the sinker loop, in a swinging direction of the movable sinker 5 is an operating direction, the movable sinker 5 includes a projecting portion 5C at a position closer to a swinging center than a knitting yarn receiving portion 5B when seen from the swinging center of the movable sinker 5. The projecting portion 5C is projected out more toward the operating direction than the knitting yarn receiving portion 5B. When a virtual line connecting a holding point of the knitting yarn 8 in the hook 3F when the knitting yarn 8 is pulled in with the hook 3F of the knitting needle 3 and a holding point of the knitting yarn 8 in the fixed sinker 4 is defined, the projecting portion 5C when the movable sinker 5 is arranged at the inoperative position is arranged on an upper side of the needle bed 2 than the virtual line.