A flat knitting machine comprising: a needle bed including a plurality of knitting needles; a fixed sinker immovably fixed on a needle bed gap side of the needle bed, the fixed sinker being suitable for forming a sinker loop of a knitted fabric to be held on the needle bed; and a movable sinker arranged at a position parallel to the fixed sinker in the needle bed, and configured to be swung between an operative position of pushing down the sinker loop toward a lower side of the needle bed gap and an inoperative position of not making contact with the sinker loop; wherein, when assuming a direction from the inoperative position to the operative position in a swinging direction of the movable sinker is an operating direction, the movable sinker includes a knitting yarn receiving portion that is meant to make contact with the sinker loop to push down the sinker loop when swung in the operating direction; wherein the movable sinker includes a projecting portion at a position adjacent to the knitting yarn receiving portion, with its position being closer to a swinging center than the knitting yarn receiving portion when seen from the swinging center of the movable sinker; wherein the projecting portion is projecting out toward the operating direction more than the knitting yarn receiving portion; and wherein when a virtual line connecting a holding point of a knitting yarn in a hook when the knitting yarn is pulled in with the hook of the knitting needle and a holding point of the knitting yarn where the knitting yarn is hooked in the fixed sinker is defined, the projecting portion when the movable sinker is arranged at the inoperative position is arranged on an upper side of the needle bed above the virtual line, characterized in that when seen from a longitudinal direction of the needle bed, the projecting portion is arranged on an inner side of a contour line of the fixed sinker within an entire swinging range of the movable sinker. a needle bed including a plurality of knitting needles; a fixed sinker immovably fixed on a needle bed gap side of the needle bed, the fixed sinker being suitable for forming a sinker loop of a knitted fabric to be held on the needle bed; and a movable sinker arranged at a position parallel to the fixed sinker in the needle bed, and configured to be swung between an operative position of pushing down the sinker loop toward a lower side of the needle bed gap and an inoperative position of not making contact with the sinker loop; wherein, when assuming a direction from the inoperative position to the operative position in a swinging direction of the movable sinker is an operating direction, the movable sinker includes a knitting yarn receiving portion that is meant to make contact with the sinker loop to push down the sinker loop when swung in the operating direction; wherein the movable sinker includes a projecting portion at a position adjacent to the knitting yarn receiving portion, with its position being closer to a swinging center than the knitting yarn receiving portion when seen from the swinging center of the movable sinker; wherein the projecting portion is projecting out toward the operating direction more than the knitting yarn receiving portion; and wherein when a virtual line connecting a holding point of a knitting yarn in a hook when the knitting yarn is pulled in with the hook of the knitting needle and a holding point of the knitting yarn where the knitting yarn is hooked in the fixed sinker is defined, the projecting portion when the movable sinker is arranged at the inoperative position is arranged on an upper side of the needle bed above the virtual line, characterized in that when seen from a longitudinal direction of the needle bed, the projecting portion is arranged on an inner side of a contour line of the fixed sinker within an entire swinging range of the movable sinker.