A focusing state measuring apparatus for measuring a focusing state of a working apparatus with respect to a target object so as to perform work, the focusing state measuring apparatus comprising: a base plate installed in the working apparatus performing work on the target object and spaced apart from the target object; a first line beam generation unit provided on one side of the base plate and configured to irradiate a first line beam toward the target object; and a second line beam generation unit provided on one side of the base plate so as to be spaced apart from the first line beam generation unit in a first direction and configured to irradiate a second line beam toward the target object, wherein the focusing state of the working apparatus comprises: a focusing distance indicating a separation distance between the working apparatus and the target object; and a focusing gradient indicating a tilt degree of the working apparatus with respect to a work plane of the target object, and wherein the focusing state measuring apparatus is configured that the focusing state of the working apparatus with respect to the target object is determined based on a comparison of the first line beam irradiated onto the target object and the second line beam irradiated onto the target object, and the focusing state of the working apparatus with respect to the target object is determined to be accurate, if the first line beam and the second line beam match each other. a base plate installed in the working apparatus performing work on the target object and spaced apart from the target object; a first line beam generation unit provided on one side of the base plate and configured to irradiate a first line beam toward the target object; and a second line beam generation unit provided on one side of the base plate so as to be spaced apart from the first line beam generation unit in a first direction and configured to irradiate a second line beam toward the target object, wherein the focusing state of the working apparatus comprises: a focusing distance indicating a separation distance between the working apparatus and the target object; and a focusing gradient indicating a tilt degree of the working apparatus with respect to a work plane of the target object, and wherein the focusing state measuring apparatus is configured that the focusing state of the working apparatus with respect to the target object is determined based on a comparison of the first line beam irradiated onto the target object and the second line beam irradiated onto the target object, and the focusing state of the working apparatus with respect to the target object is determined to be accurate, if the first line beam and the second line beam match each other. a focusing distance indicating a separation distance between the working apparatus and the target object; and a focusing gradient indicating a tilt degree of the working apparatus with respect to a work plane of the target object, and wherein the focusing state measuring apparatus is configured that the focusing state of the working apparatus with respect to the target object is determined based on a comparison of the first line beam irradiated onto the target object and the second line beam irradiated onto the target object, and the focusing state of the working apparatus with respect to the target object is determined to be accurate, if the first line beam and the second line beam match each other.