The utility model provides a stop piece for a zipper, which is simple in structure, capable of acquiring good clamping force for a zipper tape and conducting a calking operation with a good size precision, and provides a zipper having the stop piece. The stop piece (14) is connected to at least one end of a zipper teeth row (12) which can be engaged or isolated through a zipper head (13) and is fixed to the end edge of a zipper belt (11) through calking. The stop piece comprises a pair of leg portions (21, 22) and a connection portion (23) which connects the pair of leg portions (21, 22) and bears plastic deformation when the zipper belt (11) undergoes calking and fixing. The cross section of the connection portion (23) is approximately U-shaped. The inner side of the stop piece (14) is provided with a first channel portion or protruding strip portion (24) formed along the length direction of the zipper belt (11), and a second channel portion or protruding strip portion (25) formed along a direction intersecting with the first channel portion or protruding strip portion (24).