A device for adjustment of a tracking lens, comprising: zoom instruction input means to which an instruction for moving a zoom lens movable to change a focal length is inputted; focus instruction input means to which an instruction for moving a focus lens movable to focus on a subject is inputted; tracking instruction input means to which an instruction for moving a tracking lens movable to change a position of an image plane is inputted; image signal obtaining means which obtains an image signal from a camera device having a lens device mounted thereon, the lens device having the zoom lens, the focus lens, and the tracking lens; determining means which determines whether a state is a first adjustment state in which the zoom lens is set by the zoom instruction input means at a position on a tele side and the focus lens is moved by the focus instruction input means or a second adjustment state in which the zoom lens is set by the zoom instruction input means at a position on a wide side and the tracking lens is moved by the tracking instruction input means; area setting means which sets a detection area for detecting a focus state of the lens device with respect to the image signal obtained by the image signal obtaining means, the area setting means switching a size of the detection area between the first adjustment state and the second adjustment state based on the determination result of the determining means; and evaluation value generating means which generates an evaluation value indicating the focus state of the lens device from the image signal obtained by the image signal obtaining means, the evaluation value generating means generating the evaluation value within the detection area set by the area setting means in an entire screen region of the image signal; characterized in that said device for adjustment of a tracking lens further comprises display means which displays the evaluation value generated by the evaluation value generating means, and the determining means determines whether the state is the first adjustment state or the second adjustment state based on the image signal picked up from an adjustment chart and obtained from the camera device. zoom instruction input means to which an instruction for moving a zoom lens movable to change a focal length is inputted; focus instruction input means to which an instruction for moving a focus lens movable to focus on a subject is inputted; tracking instruction input means to which an instruction for moving a tracking lens movable to change a position of an image plane is inputted; image signal obtaining means which obtains an image signal from a camera device having a lens device mounted thereon, the lens device having the zoom lens, the focus lens, and the tracking lens; determining means which determines whether a state is a first adjustment state in which the zoom lens is set by the zoom instruction input means at a position on a tele side and the focus lens is moved by the focus instruction input means or a second adjustment state in which the zoom lens is set by the zoom instruction input means at a position on a wide side and the tracking lens is moved by the tracking instruction input means; area setting means which sets a detection area for detecting a focus state of the lens device with respect to the image signal obtained by the image signal obtaining means, the area setting means switching a size of the detection area between the first adjustment state and the second adjustment state based on the determination result of the determining means; and evaluation value generating means which generates an evaluation value indicating the focus state of the lens device from the image signal obtained by the image signal obtaining means, the evaluation value generating means generating the evaluation value within the detection area set by the area setting means in an entire screen region of the image signal;