A knit design device for designing a knit to be knitted by a knitting machine, and comprising a monitor for displaying design data of the knit and input means used by a user, the knit design device comprising: design storage means (20, 22) for storing a design of a structural pattern along with a mark (81 through 87, 96, 100 through 102, 111, 112, 130 through 132) means for storing a knitting program of the structural pattern and a parameter of the knitting program to display the mark so as to represent the parameter in response to when the user moves the mark, means for displaying the marks on the structural pattern or in the vicinity thereof on the monitor, along with the design of the structural pattern; and design changing means for, when a user moves the marks on the monitor by using the input means, changing the design of the structural pattern, to display the changed design on the monitor, and the marks comprising at least positional marks (81, 100, 110, 130) for the structural pattern and individual pattern marks (83 through 86, 96, 101, 111, 112, 131, 132) corresponding to a plurality of individual patterns of the structural pattern, and the design changing means moves a position of the structural pattern by moving the positional marks (81, 100, 11 0, 130) and changes designs of the plurality of individual patterns of the structural pattern by moving the individual pattern marks (83 through 86, 96,101,111,112,131,132), wherein the structural pattern comprising at least a gathering pattern and a crossed pattern, and wherein the design changing means moves the individual pattern marks (111, 112) of the gathering pattern to thereby change width or pitch of gathering parts according to the number of gathering parts, and further moves an individual pattern mark (83 through 86, 131, 132), on one end in a horizontal direction of the crossed pattern to thereby change a design of the other end in the horizontal direction of the crossed pattern so as to obtain a symmetry, and wherein the marks further comprising size marks (82, 102) for the structural pattern, and the design changing means changes a size of the structural pattern by moving the size marks (82, 102), and repeats the individual patterns so as to fill in the changed size. design storage means (20, 22) for storing a design of a structural pattern along with a mark (81 through 87, 96, 100 through 102, 111, 112, 130 through 132) means for storing a knitting program of the structural pattern and a parameter of the knitting program to display the mark so as to represent the parameter in response to when the user moves the mark, means for displaying the marks on the structural pattern or in the vicinity thereof on the monitor, along with the design of the structural pattern; and design changing means for, when a user moves the marks on the monitor by using the input means, changing the design of the structural pattern, to display the changed design on the monitor, and the marks comprising at least positional marks (81, 100, 110, 130) for the structural pattern and individual pattern marks (83 through 86, 96, 101, 111, 112, 131, 132) corresponding to a plurality of individual patterns of the structural pattern, and the design changing means moves a position of the structural pattern by moving the positional marks (81, 100, 11 0, 130) and changes designs of the plurality of individual patterns of the structural pattern by moving the individual pattern marks (83 through 86, 96,101,111,112,131,132), wherein the structural pattern comprising at least a gathering pattern and a crossed pattern, and wherein the design changing means moves the individual pattern marks (111, 112) of the gathering pattern to thereby change width or pitch of gathering parts according to the number of gathering parts, and further moves an individual pattern mark (83 through 86, 131, 132), on one end in a horizontal direction of the crossed pattern to thereby change a design of the other end in the horizontal direction of the crossed pattern so as to obtain a symmetry, and wherein the marks further comprising size marks (82, 102) for the structural pattern, and the design changing means changes a size of the structural pattern by moving the size marks (82, 102), and repeats the individual patterns so as to fill in the changed size.