A device for applying a hair product which includes a support on one face of which there projects application elements. The application elements are arranged such that a first group of application elements of a first row is superposable, along a longitudinal axis (X) of the support, with a second group of application elements of a second row. The application elements of the second group have a mean flexibility and/or a mean height that is greater respectively than the mean flexibility and/or the mean height of the application elements of the first group. In addition, the mean of the spacings between application elements that make up the second group is less than the mean of the spacings between application elements that make up the first group.