To provide a joining method of a knitted fabric in which stretchability of a joining portion can be sufficiently ensured when joining through a bind-off process two knitted fabrics, which are independently knitted, with ends in a wale direction of the knitted fabrics butted against each other. When starting the joining of the knitted fabrics (100, 200) from a boundary of the first knitted fabric (100) and the second knitted fabric (200), formation of a bind-off stitch (P1, P2) is repeated in each of the first knitted fabric (100) and the second knitted fabric (200). A pickup stitch (R) is formed on an empty needle of either the front or the back needle bed and removed from the needle bed thereafter between the formation of the bind-off stitch (P1) in the first knitted fabric (100) and the formation of the bind-off stitch (P2) in the second knitted fabric (200) to increase a yarn length connecting the first bind-off stitch (P1) and the second bind-off stitch (P2).