Using the high‐resolution measurements from magnetospheric multiscale mission, here we present the observational evidence of kinetic interchange instabilities (ICIs) at dipolarization fronts (DFs). Specifically, we present the observation of two DFs caused by ICI, and discover the sub‐ion scale magnetic depression caused by kinetic‐scale ICI at the second DF. By using multi‐spacecraft observation, the typical process inside the magnetic hole (MH)—by electron trapping process—is clearly shown in the magnetic depression, evidencing that the depression is a sub‐ion MH generated at DF by kinetic ICI. Based on observations and Minimum Variance Analysis (MVA) analysis, we present a two‐dimensional image of the ICI in the nonlinear stage. This observational study demonstrates the kinetic ICI at DFs, confirming the existence of MH generated by ICI at DF, and improves the understanding of dynamics at DFs. Plain Language Summary Taking advantage of the high‐resolution measurements from magnetospheric multiscale mission, we present the direct evidence of kinetic interchange instabilities (ICIs) at the dipolarization fronts (DFs). Specifically, two DFs caused by ICI and magnetic depression at the second DF caused by kinetic ICI are observed in our study. By comparing the measurements of three spacecraft, we find that the magnetic depression at second DF can trap the electrons, which is the typical process inside the magnetic hole. We plot a two‐dimensional image to illustrate the ICI at DFs, and the image well fits the observations and the results of Minimum Variance Analysis (MVA) analysis. Key Points We present the observational evidence of kinetic interchange instabilities at dipolarization fronts (DFs) Based on observations and Minimum Variance Analysis (MVA) analysis, we present a 2D image of the interchange instabilities at the DFs Direct evidence of sub‐ion magnetic hole caused by interchange instabilities at DF